Question

5.6×0.35+0.56×1.2+0.047×44简便计算

Answer 1

    5.6×0.35+0.56×1.2+0.047×44

=5.6×0.35+5.6×0.12+0.047×44   .............根据积不变的性质改写

=5.6×（0.35+0.12）+0.047×44   .............部分使用乘法的分配律

=5.6×0.47 + 0.47×4.4   .............改写

=0.47×（5.6+4.4）    .........乘法的分配律

=0.47×10

=4.7

Answer 2

5.6×0.35+0.56×1.2+0.047×44
=5.6×0.35+5.6×0.12+0.047×44
=5.6×(0.35+0.12)+0.47×4.4
=(5.6+4.4)×0.47
=10×0.47
=4.7