1樓:聆聽萬物
脫式計算1/12+0.25×4/5-0.125解題思路:四則運算規則(按順序計算,先算乘除後算加減,有括號先算括號,有乘方先算乘方)即脫式運算(遞等式計算)需在該原則前提下進行
解題過程:
1/12+0.25×4/5-0.125
=1/12+1/4×4/5-1/8
=1/12+1/5-1/8
=10/120+24/120-15/125=(10+24-15)/120
=19/120
擴充套件資料#約分:判斷分數是否為最簡分數的依據可以根據分子分母的公因數是否只有1,如果只有1則該分數為最簡分數,反之不是最簡分數;若分子分母存再小數可以先進行化整後再判斷
解題過程:
因為分子分母的公因數為[1]
19/120:已經為最簡分數不需要再化簡
存疑請追問,滿意請採納
2樓:隕落晨星
根據題目:式子可以這樣計算。
1/12+0.25×4/5-0.125
=1/12+1/4×4/5-1/8
=1/12+1/5-1/8
=10/120+24/120-15/120=19/120
3樓:七色彩虹之毛毛
解:1/12+0.25×4/5-0.125等於( 19/120 )
∵已知需求出1/12+0.25×4/5-0.125等於多少
∴1/12 + 0.25 × 4/5 - 0.125
= 1/12 + 25/100 × 4/5 - 125/1000
= 1/12 + 1/4 × 4/5 - 1/8
= 1/12 + 1/5 - 1/8
= (1×10)/(12×10)+(1×24)/(5×24)- (1×15)/(8×15)
= 10/120 + 24/120 - 15/120
= 34/120 - 15/120
= 19/120
答:1/12+0.25×4/5-0.125等於19/120
0.125×2.75+8分之1×4.25+12.5%答案脫式計算
4樓:
0.125x2.75+1/8x4.25+12.5%=1/8x2.75+1/8x4.25+1/8=1/8x(2.75+4.25+1)
=1/8x8=1
5樓:她是我的小太陽
脫式計算方法如下:
0.125x2.75+1/8x4.25+12.5%=1/8x2.75+1/8x4.25+1/8=1/8x(2.75+4.25+1)
=1/8x8=1
0點125乘4分之3加8分之1乘8點25加百分之12點5脫式計算
6樓:匿名使用者
0.125×3/4+1/8×8.25+12.
5%=0.125×0.75+0.
125×8.25+0.125=0.
125×(0.75+8.25+1)
=0.125×10
=1.25
脫式計算能簡便的漸變6.8乘0.75/0.5 13.75/0.125-2.75 1.53+23.4/7.2 2.85/1.25/0.8 10.5*0.25*12
7樓:新野旁觀者
6.8乘0.75/0.5
=6.8×(0.75×2)
=6.8×1.5
=10.2
13.75/0.125-2.75
=13.75×8-2.75
=110-2.75
=107.25
1.53+23.4/7.2
=1.53+23.4÷9÷0.8
=1.53+2.6÷0.8
=1.53+3.25
=4.78
2.85/1.25/0.8
=2.85÷(1.25×0.8)
=2.85
10.5*0.25*12
=10.5×(12÷4)
=10.5×3
=31.5
8樓:牢昊碩
你怎麼跟我要求的一樣啊,第一題我會,10.24/1.25/8 =10.24/(1.25*8) =10.24/10 =1.024
9樓:摯愛
0.25乘32乘1.7乘12.5的簡便計算脫式,誰能幫幫我啊!謝謝各位了!o(∩_∩)o~
六年級脫式計算題(簡便計算也行、最重要的是要帶答案和過程!!!)
10樓:不願失去鉨
1.(1/69+2/71)乘23+25除以71
=1/69*23+2/71*23+25/71
=1/3+(46/71+25/71)
=1/3+1
=4/3
2.(1+1/2)乘(1-1/2)乘(1+1/3)乘(1-1/3)乘........乘(1+1/9)乘(1-1/9)
=3/2*1/2*4/3*2/3...*10/9*8/9
=1/2*10/9(中間的都約去了)
=5/9
3.1/2乘3+1/3乘4+.......+1/19乘20
=1/2-1/3+1/3-1/4+...+1/19-1/20
=1/2-1/20
=9/20
4.1/27+505/2727+131313/272727
=1/27+5*101/(27*101)+13*10101/(27*10101)
=1/27+5/27+13/27
=19/27
5.100-98+96-94+....+4-2
=(100-98)+(96-94)+...(4-2)
=2+2+...+2(共有25個)
=2*25
=50五十二又二十五分之十一×79.45+159×47.56+七十九又二十分之十一×52.44
=52.44×79.45+159×47.56+79.55×52.44
=52.44×(79.45+79.55)+159×47.56
=52.44×159+159×47.56
=159×(52.44+47.56)
=159×100
=15900
3)2002+2001-2000-1999+1998+1997-1996-1995+……+2+1
=(2002-2000)+(2001-1999)+(1998-1996)+(1997-1995)+……+(6-4)+(5-3)+2+1
=2+2+2+2+……+2+2(從3-2002共2000個數,所以有1000個2)+2+1
=1000×2+2+1
=2003
4,5兩題均用到一個轉換式1/(a×b)=1/(b-a)×(1/a-1/b)
如1/15=1/(3×5)=1/(5-3)×(1/3-1/5)=1/2×(2/15)=1/15可驗證一下
4)(1×2分之一)+(2×3分之一)+(3×4分之一)+……+(10×11分之一)
=1/(1×2)+1/(2×3)+1/(3×4)+……+1/(10×11)
=(1-1/2)+(1/2 - 1/3)+(1/3 - 1/4)+……+(1/10 - 1/11)
=1-1/11
=10/11
5)三分之一+十五分之一+三十五分之一+六十三分之一+九十九分之一
=1/(1×3)+1/(3×5)+1/(5×7)+1/(7×9)+1/(9×11)
=1/2×(1-1/3)+1/2×(1/3-1/5)+1/2×(1/5-1/7)+1/2×(1/7-1/9)+1/2×(1/9-1/11)
=1/2×(1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + 1/9 - 1/11)
=1/2×(1-1/11)
=1/2×10/11
=5/11
6)一又二分之一-六分之五+十二分之七-二十分之九+三十分之十一-四十二分之十三+五十六分之十五
(根據提示,1又1/2=1+1/2,+1/2+1/3=5/6……)
=(1+1/2)-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1+ 1/2 - 1/2 - 1/3 + 1/3 + 1/4 - 1/4 - 1/5 + 1/5 + 1/6 - 1/6 - 1/7 + 1/7 + 1/8
=1+1/8
=9/8 2010-2-8 20:141.125*3+125*5+25*3+25
11樓:咚咚鏘
34×3.535-3.5×34.34
=34×3.5×1.01-3.5×34×1.01=08+89+899+8999+89999=9+90+900+9000+90000-5=99999-5
=99994
0.67×2.1+0.
018×21+8.5×0.79=0.
67×2.1+0.18×2.
1+8.5×0.79=(0.
67+0.18)×2.1+8.
5×0.79=0.85×2.
1+0.85×7.9
=0.85×(2.1+7.9)
=0.85×10
=8.5
22222.2×9.99999
=22222.2×(10-0.00001)=222222-0.222222
=222221.777778
1997×19961996-1996×19971997=1997×1996×10001-1996×1997×10001=00.02+0.04+0.
06+0.08+……+19.94+19.
96+19.98
=(0.02+19.98)×999÷2
=10×999
=9990
99999×77778+33333×66666=99999×77778+99999×22222=99999×(77778+22222)
=99999×100000
=9999900000
(4又5/6-3又3/4)/(3/14+2/7)=13/12÷1/2
=13/6
=2又1/6
(4.8/1又4/5+3又1/2+7又1/3)*4/9=(2又2/3+7又1/3+3.5)*4/9=(10+3.5)*4/9
=13.5*4/9
=617.2/【(3又2/5-1.25)*2/3】=17.2/【2.15*2/3】
=17.2÷43/3
=1.2
5*5又1/5
=5*5+5*1/5
=25+1
=26(5又2/5-1.8)/[(1.15+13/20)*1又2/3]
=3.6/[1.8*5/3]
=3.6/3
=1.2
3又5/8*5又1/5+5又1/5*6又3/8=5.2*(3又5/8+6又3/8)
=5.2*10
=52[3/4-7/8/(5/6+4/5)]*28=[3/4-7/8÷49/30]*28
=[3/4-15/28]*28
=3/4*28-15/28*28
=21-15
=6(1.25*4/5-0.76)/(1又3/8+1又1/40)=(1-0.76)/2.4
=0.24/2.4
=0.1
[(0.2+1/3)*4.5]/(8又1/20-6.45)=8/15*4.5/1.6
=2.4/1.6
=1.5
x+3又2/3=5
x*9又3/4=7又1/11 x/2/5=106又2/3-x=4.25 6.4*1.
7+6又2/5*8.3(4又6/7+1.75)/1又11/14+3又5/62.
16-7x=0.06
1/2x-0.5=5又1/2
8.16-1.26/0.3*1.5
=8.16-4.2*1.5
=8.16-6.3
=1.86
8.4*[(1.2+3又1/3)/3.4-1/2]=8.4*[68/16/3.4-1/2]
=8.4*[5/4-1/2]
=8.4*3/4
=6.3
5.8:x=3又1/2:7
3.5x=7*5.8
x=7/3.5*5.8
x=2*5.8
x=11.6
3/10*55-4x=14.5
16.5-4x=14.5
4x=2
x=0.2
19.38-4又7/8-5又1/8
=1.938-(4又7/8+5又1/8)
=19.38-10
=9.38
13又7/13-(6又3/5+3又7/13)=13又7/13-3又7/13-6又3/5=10-6又3/5
=3.4
1又3/4+[2又3/14-(2又3/14-1.875)]/2又1/12
=1又3/4-15/8*12/25
=1又3/4-9/10
=0.85
(9.4-8又2/5)/[(1.1+1/15)*1又7/18]=1/[7/6*25/18]
=1÷175/108
=108/175
脫式計算(78 52120 ,脫式計算 (78 52) (120 60) (128 72) 12 48 80 (16 405 14 9) 68 7 (44 6
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