1樓:瀛洲煙雨
14.4÷(1.75+1.25)
=14.4÷3
=4.8
直接算最簡便
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
2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 (能用簡便方法的簡便計算)①2.07÷2.5÷0.4 ②21.36÷0.8-12.9 ③0.125×32×2.5 ④0.65×20
3樓:鑽石
①源2.07÷2.5÷0.4,
bai=2.07÷(2.5×
du0.4),
=2.07÷1,zhi
=2.07;
②21.36÷0.8-12.9,
=26.7-12.9,
=13.8;
③0.125×32×2.5,
=0.125×8×4×2.5,
=(0.125×8)×(4×2.5),
=1×10,
=10;
④dao0.65×201,
=0.65×(200+1),
=0.65×200+0.65×1,
=130+0.65,
=130.65;
⑤1.2×2.5+8×0.25,
=1.2×2.5+0.8×2.5,
=(1.2+0.8)×2.5,
=2×2.5,
=5;⑥50.4×19+50.4,
=50.4×(19+1),
=50.4×20,
=1008.
脫式計算,能簡便的要簡便計算. 14-11.3-1.7 54÷2.5÷0.4 3.2×0.2
4樓:泡沫
(1)14-11.3-1.7,
=14-(11.3+1.7),
=14-13,
=1;(2)54÷2.5÷0.4,
=54÷(2.5×0.4),
=54÷1,
=54;
(3)3.2×0.28+0.28×6.8,=(3.2+6.8)×0.28,
=10×0.28,
=2.8;
(4)80.3-33.3×0.5÷0.37,=80.3-16.65÷0.37,
=80.3-45,
=35.3.
5樓:買群刀仕
3.6÷0.4-1.2×5
=9-6=3
90÷【3.6-1.8】=90/1.8=50
【31.6-11.7】÷2.
5÷0.4=【31.6-11.
7】÷(2.5*0.4)=【31.
6-11.7】÷1=31.7-0.
1-11.7=19.9
3.4×7.8÷3.9=3.4*(7.8÷3.9)=3.4*2=6.8
5.23×4+4.77÷0.25=5.23×4+4.77×4=(5.23+4.77)×4=10×4=40
基本思路就是結合法,分子分母同時放大等倍數
法,再簡單?那就用筆挨個做除法吧!這些很容易理解的,你可以好好的看一下!
脫式計算(能簡算的用簡便演算法).(1)[9.2+0.8×(9-7.75)]÷0.4; (2)3.5×9.8+0.35×2;(3)
6樓:寧負迅昭
(1)[9.2+0.8×(
9-7.75)]÷0.4
=[9.2+0.8×1.25]÷4
=[9.2+1]÷4
=2.55
(2)3.5×9.8+0.35×2
=3.5×(9.8+0.2)
=3.5×10
=35(3)28×26
27=(27+1)×
2627
=27×26
27+26
27=26+26
27=2626
27(4)[(23-3
5)×154+2
3]÷11
12=[1
15×154+2
3]÷11
12=[14+2
3]÷11
12=11
12×12
11=1
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