Question

数学简便简便计算

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Answer 1

4.8X0.25=(4+0.8)X0.25=4X0.25+0.8X0.25=1+0.2=1.2
0.78X98=0.78X(100-2)=0.78X100-0.78X2=78-1.56=76.44
0.5X2.33X8=(0.5X8)X0.33=4X0.33=1.32
1.5X105=1.5X(100+5)=150+7.5=157.5
0.3X2..5X0.4=0.3X(2.5X0.4)=0.3X1=0.3
1.2X2.5+0.8X2.5=2.5X(1.2+0.8)=2.5X2=5
打字很累，采纳谢谢

Answer 2

4.8x0.25
=4.8x1/4
=1.2
1.5x105
=1.5x（100+5）
=1.5x100+1.5x5
=15+7.5
=22.5
0.78x98
=0.78x（100-2）
=0.78x100-0.78x2
=78-1.56
=76.44
0.3x2.5x0.4
=0.3x（2.5x0.4)
=0.3x1
=0.3
0.5x2.33x8
=（0.5x8）x2.33
=（1/2x8）x2.33
=4x2.33
=9.32
1.2x2.5+0.8x2.5
=（1.2+0.8）x2.5
=2x2.5
=5

Answer 3

=0.25x(4+0.8)=1+0.2=1.2;=0.78x(100-2)=78-1.56=76.44;

Answer 4

一共五人2*5+2.5*2+2.5

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Answer 5

～～网络差，看不了图片

Answer 6

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