19.98×37-199.8×1.9 1998×0.
问题描述:
19.98×37-199.8×1.9 1998×0.
答
19.98×51 199.8×3.9 199.8
=19.98×51 199.8×39 19.98×10
=19.98×(51 39 10)
=19.98×100
=1998