Question

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5.7，多多少？

Answer 1

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

Answer 2

4.12*10.1=4.12*（10+0.1）=41.2+0.412=41.612
1.25*3.2*5=1.25*0.8*4*5=1.25*0.8*4*5=20
8.7*4.3+8.7*5.7=8.7*（4.3+5.7）= 87
8个4.05比5.7，多多少？顾名思义就是8*4.05-5.7=8*（4+0.05）-5.7
=26.7 不知道这样算不算简便