21.36÷0.8-12.9 简算

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21.36÷0.8-12.9 简算
可见简算的 简算 不行的不用

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252300110 共回答了22个问题 | 采纳率95.5%
21.36÷0.8-12.9=21.36*5/4 - 12.9 = 5.34*5 -12.9 = 26.7 - 12.9 = 3.8
1年前

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脱式计算 (能用简便方法的简便计算)①2.07÷2.5÷0.4 ②21.36÷0.8-12.9 ③0.125×32×2.

脱式计算 (能用简便方法的简便计算)
①2.07÷2.5÷0.4

②21.36÷0.8-12.9
③0.125×32×2.5
④0.65×201
⑤1.2×2.5+8×0.25
⑥50.4×19+50.4.
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①2.07÷2.5÷0.4,
=2.07÷(2.5×0.4),
=2.07÷1,
=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;

④0.65×201,
=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.
7.4-0.15*2.8要简便 21.36/0.8-12.9要简便 4*(1.5+0.25)要简便
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7.4-0.15*2.8=7.4-0.15*(3-0.2)=7.4-(0.15*3+0.15*0.2)=7.4-(0.45+0.03)=6.98
21.36/0.8-12.9=(22-0.64)/0.8-(13-0.1)=22/0.8-0.64/0.8-(13-0.1)=27.5-0.8-13-0.1=13.6
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计算下面各题.21.36÷0.8-12.9
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21.36÷0.8-12.9 可以简算就简算 0.65x201 2.5x4.25x0.8
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(1)21.36/0.8-12.9
=213.6/8-129
=(160+48+5.6)/8-129
=20+6+0.7-129
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(2)0.65*201
=0.65*(200+1)
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=2.5*0.8*4.25
=2*4.25
=8.5
21.36÷0.8-12.9的简算
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请用普通的递等式算法计算,不然我会看不懂的……
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21.36÷0.8-12.9
=21.36÷4/5-12.9
=21.36×5/4-12.9
=5·34×5-12.9
=26·7-12.9
=13·8