用简便方法计算．3.5×37+6.5×37；15.85-4.8-5.2；1.25×3.2×0.8．

Question

用简便方法计算．
3.5×37+6.5×37；           15.85-4.8-5.2；          1.25×3.2×0.8．

Answer 1

（1）3.5×37+6.5×37
=（3.5+6.5）×37
=10×37
=370

（2）15.85-4.8-5.2
=15.85-（4.8+5.2）
=15.85-10
=5.85

（3）1.25×3.2×0.8
=（1.25×0.8）×3.2
=1×3.2
=3.2