1樓:周以荷
(1)250×16-48048÷24,
=4000-2002,
=1998;
(2)18÷1.5-0.5×0.3,
=12-0.15,
=11.85;
(3)25×1.25×32,
=25×1.25×4×8,
=(25×4)×(1.25×8),
=100×10,
=1000;
(4)5.58-3 5
+5.42-2 5
,=(5.58+5.42)-(3 5
+2 5
),=11-1,
=10;
(5)(5 6
+712
+3 8
)÷148
,=(5 6
+712
+3 8
)×48,
=5 6
×48+7
12×48+3 8
×48,
=40+28+18,
=68+18,
=86;
(6)[1-(1 2
+1 3
)×1 5
]÷5 6
,=[1-5 6
×1 5
]÷5 6
,=[1-1 6
]÷5 6
,=5 6
÷5 6
,=1.
脫式計算,能簡算的要簡算.(1)0.26×2.5+0.74×2.5+2.5(2)18.09-
2樓:浮雲
①0.26×2.5+0.74×2.5+2.5,=(0.26+0.74+1)×2.5,
=2×2.5,
=5;②18.09-7.5×(0.14+1.06),=18.09-7.5×1.2,
=18.09-9,
=9.09;
③9÷[(38.02+1.98)×0.5],=9÷[40×0.5],
=9÷20,
=0.45.
脫式計算,能簡便計算的要簡算. (1)13÷0.4÷2.5 (2)64×4.5+36×4.5 (3)1.25×2.5×0.8
3樓:手機使用者
(1)13÷0.4÷2.5,
=13÷(0.4×
回2.5),
=13÷1,
=13;
(2)64×4.5+36×4.5,
=(64+36)×答4.5,
=100×4.5,
=450;
(3)1.25×2.5×0.8,
=1.25×0.8×2.5,
=1×2.5,
=2.5;
(4)1.5×101-1.5,
=1.5×(101-1),
=1.5×100,
=150;
(5)14.64+3.7×2.8,
=14.64+10.36,
=25;
(6)2.8×7.3+0.27×28,
=2.8×7.3+2.7×2.8,
=2.8×(7.3+2.7),
=2.8×10,
=28.
脫式計算.(能簡算的要簡算)①1÷0.25+0.25÷1-2.5×0.1②1+2+3+4+5+6+5+4+3+2+16666662③22×4+24×6+
4樓:度鍍
①1÷0.25+0.25÷1-2.5×0.1,=4+0.25-0.25,
=4+(0.25-0.25),
=4+0,
=4;②1+2+3+4+5+6+5+4+3+2+16666662
,=36
6666662
,=18×2
3333331×2
,=18
3333331;③2
2×4+2
4×6+2
6×8+2
8×10
+210×12,=1
2-14+1
4-16+1
6-18+1
8-110+1
10-112,
=12-112,=5
12;④1÷(1-0.99)-99÷(1-0.999),=1÷0.01-99÷0.001,
=100-99000,
=-98900.
脫式計算(能簡算的要簡算
5樓:軒胤
(1)6.72-2.3÷0.5×0.8
=6.72-4.6×0.8
=6.72-3.68
=3.04;
(2)98-1
7+18-6
7=(98+1
8)-(17+6
7)=54
-1=14;
(3)9
10÷[1
2×(65-3
10)]
=910
÷[12
×910]=9
10÷9
20=2;
(4)(27+1
5)×7×5=27
×7×5+1
5×7×5
=10+7
=17.
脫式計算,能簡算的要簡算
6樓:洪禕枋
(1)4.2×5.5×1.2
=23.1×1.2
=27.72
(2)4.6×1.45-1.08
=6.67-1.08
=5.59
(3)183×0.4÷24+1.65
=73.2÷24+1.65
=3.05+1.65
=4.7
(4)4.87×2.34+4.87×7.66=4.87×(2.34+7.66)
=4.87×10
=48.7
(5)19.625-(4.716+9.625)=19.625-4.716-9.625
=(19.625-9.625)-4.716=10-4.716
=5.284
(6)6.4×9+6.4
=6.4×(9+1)
=6.4×10=64
脫式計算(能簡算的要簡算),脫式計算(能簡算要簡算)?
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能簡算的要簡算,脫式計算,能簡算的要簡算?
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