Question

简便计算（脱式）

72*1.25
1.25*32*0.25
101*7.8

Answer 1

72*1.25

=9*8*1.25

=9*10

=90
1.25*32*0.25

=1.25*8*4*0.25

=10*1

=10
101*7.8

=(100+1)*7.8

=100*7.8+1*7.8

=780+7.8

=787.8

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Answer 2

72×1.25
=9×(8×1.25)
=9×10
=90
1.25×32×0.25
=(1.25×8)×(4×0.25)
=10×1
=10
101×7.8
=(100+1)×7.8
=100×7.8+7.8×1
=780+7.8
=787.8

Answer 3

72x1.25
=9x8x1.25
=9x10
=90

1.25x32x0.25
=1.25x8x4x0.25
=10x1
=10

101x7.8
=(100+1)x7.8
=100x7.8+1x7.8
=780+7.8
=787.8

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Answer 4

72*1.25
=9*8*1.25
=9*（8*1.25）
=9*10
=90
1.25*32*0.25
=1.25*8*4*0.25
=（1.25*8）*94*0.25）
=10*1
=10
101*7.8
=（100+1）*7.8
=100*7.8-1*7.8
=780-7.8
=772.2

Answer 5

72*1.25
=9x8x1.25
=9x(8x1.25)
=9x10
=90
1.25*32*0.25
=(1.25x8)x(0.25x4)
=10x1
=10

101*7.8
=(100+1)x7.8
=100x7.8+1x7.8
=787.8

Answer 6

72*1.25=7*8*1.25=7*10=70
7.25*32*0.25=1.25*8*4*0.25=10*1=10
101*7.8=100*7.8+1*7.8=780+7.8=787.8