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4.12*10.1= 1.25*3.2*5= 8.7*4.3+8.7*5.7=

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4.12*10.1= 1.25*3.2*5= 8.7*4.3+8.7*5.7=
要简便计算 4.12*10.1= 1.25*3.2*5= 8.7*4.3+8.7*5.7= 8个4.05比5.多多少?
4.12*10.1= 1.25*3.2*5= 8.7*4.3+8.7*5.7=
4.12*10.1= 4.12*(10+0.1)
=4.12*10+4.12*0.1
=41.2+0.412
=41.612
1.25*3.2*5=1.25*8*0.4*5
=10*2
=20
8.7*4.3+8.7*5.7=8.7*(4.3+5.7)
=8.7*10
=87
8个4.05比5.7
即8×4.05-5.7
=8*(4+0.05)-5.7
=32+0.4-5.7
=32.4-5.7
=26.7