解方程及不等式 (1)(x+3)2+2(x-1)2=3x2+13 (2)(3x+4)(3x-4)<9(x-2)(x+3)
解方程及不等式
(1)(x+3)2+2(x-1)2=3x2+13
(2)(3x+4)(3x-4)<9(x-2)(x+3)
(1)(x+3)2+2(x-1)2=3x2+13
(2)(3x+4)(3x-4)<9(x-2)(x+3)
数学人气:644 ℃时间:2019-11-06 03:37:28
优质解答
(1)x2+6x+9+2(x2-2x+1)=3x2+13去括号,得x2+6x+9+2x2-4x+2=3x2+13移项、合并,得2x=2,系数化为1,得x=1;(2)9x2-16<9(x2+x-6)去括号,得9x2-16<9x2+9x-54移项,得54-16<9x2+9x-9x2合并,得9x>38系数化...
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