3.8×1.5+4×0.7 用递等式计算.
问题描述:
3.8×1.5+4×0.7 用递等式计算.
答
3.8×1.5+4×0.7
=1.9×2×1.5+2.8
=1.9×3+2.8
=5.7+2.8
=8.5