(1)(25+2h)(2h+2h)=888 (2) (100-2x)(90-x)=8448
问题描述:
(1)(25+2h)(2h+2h)=888 (2) (100-2x)(90-x)=8448
答
(1) 25+2h)*4h=888. 8h^2+100h-888=0.2h^2+25h-222=0. h={(-25±√[25^2-4*2*(-222)]}/2*2. =[-25√(625+1776)]/4. =(-25±√2401)/4. =(-25±49)/4.∴h1=(-25+49)/4=6; h2=(-25-49)/4...