计算. (1)89.82; (2)472-94×27+272.
问题描述:
计算.
(1)89.82;
(2)472-94×27+272.
答
(1)(89.8)2=(90-0.2)2=902-2×0.2×90+0.22=8064.04;
(2)472-94×27+272=472-2×47×27+272=(47-27)2=202=400.