Question

6.57×0.57+5.6×0.343的简便运算？

Answer 1

=6.57*0.56+6.57*0.01+5.6*0.343
=0.56*（6.57+3.43）+0.0657 乘法分配律简便运算
=0.56*10+0.0657
=5.6657

Answer 2

6.57×0.57+5.6×0.343
=0.657×10×0.57+5.6×0.343
=0.657×5.7+5.6×0.343
=0.657×(5.6+0.1)+5.6×0.343
=5.6×(0.657+0.343)+0.657×0.1
=5.6×1+0.0657
=5.6657