计算:19.98×37+199.8×2.3+9.99×80=
问题描述:
计算:19.98×37+199.8×2.3+9.99×80=
答
19.98×37+199.8×2.3+9.99×80
=19.98×37+19.98×23+(10-0.01)×80
=19.98×(37+23)+10×80-0.01×80
=19.98×60+800-0.8
=1198.8+799.2
=1998.