Question

3.25×4.9-49×0.675的简便算法？

Answer 1

3.25×4.9-49×0.675
=0.325×49-49×0.675
=（0.325-0.675）×49
=-0.35×49
=-17.15

Answer 2

先利用等式的性质，把因数改成一样的。
3.25×4.9-49×0.675
=0.325×49-49×0.675
=（0.325-0.675）×49
=-0.35×49
=-17.15
祝学习进步。