解方程(3x+1)²-(2x-1)²=(x-1)(5x+2)-24

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解方程(3x+1)²-(2x-1)²=(x-1)(5x+2)-24
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解方程(3x+1)²-(2x-1)²=(x-1)(5x+2)-24
解方程(3x+1)²-(2x-1)²=(x-1)(5x+2)-24
 

解方程(3x+1)²-(2x-1)²=(x-1)(5x+2)-24

整理
(3x+1)²-(2x-1)²=(x-1)(5x+2)-24
9x²+6x+1-(4x²-4x+1)=5x²-3x-2-24
9x²+6x+1-4x²+4x-1=5x²-3x-2-24
9x²+6x+1-4x²+4x-1-5x²+3x+2+24=0
13x=-26
解得x=-2

(3x+1)²-(2x-1)²=(x-1)(5x+2)-24
(3x+1+2x-1)(3x+1-2x+1)=5x²-3x-2-24
(5x)(x+2)=5x²-3x-26
5x²+10x-5x²+3x=-26
13x=-26
x=-2

左边:(3x+1)²-(2x-1)²=[(3x+1)+(2x-1)][(3x+1)-(2x-1)]=5x(x+2)=5x²+10x
右边:5x²-3x-26
化简得出:13x=-26
此类题要注意化简,虽然直接计算可以得出结果但费事且容易出错~~~~