1.25×39.8×0.8(简算)3.6×0.7×2.5（简算）
问题描述：
1.25×39.8×0.8(简算)3.6×0.7×2.5（简算）
答
1.25×39.8×0.8
=1.25×0.8×39.8
=1×39.8
=39.8
3.6×0.7×2.5
=0.9×4×0.7×2.5
=4×2.5×0.9×0.7
=10×0.63
=6.3