化简:(1)25(a-2b)^2-64(b+2a)^2 (2)1/8*1001-0.125
问题描述:
化简:(1)25(a-2b)^2-64(b+2a)^2 (2)1/8*1001-0.125
答
(1)原式=(5(a-2b)+8(b+2a))[5(a-2b)-8(b+2a]=-(21a-2b)(11a+18b)
(2)原式=1/8*(1000+1)-0.125=1/8*1000+1/8-1/8=125