2\x+2-(1)\x-2=0解方程并验算 (7\x^2+x)+(3\x^2-x)=(6\x^2-1)
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2\x+2-(1)\x-2=0解方程并验算 (7\x^2+x)+(3\x^2-x)=(6\x^2-1)
2\x+2-(1)\x-2=0解方程并验算 (7\x^2+x)+(3\x^2-x)=(6\x^2-1)
2\x+2-(1)\x-2=0解方程并验算 (7\x^2+x)+(3\x^2-x)=(6\x^2-1)
1、两边乘以(x+2)(x-2)得
2(x-2)-(x+2)=0
2x-4-x-2=0
∴x=6
检验:x=6是方程的解
∴方程的解是x=6
2、两边乘以x(x+1)(x-1)得
7(x-1)+3(x+1)=6x
7x-7+3x+3=6x
4x=4
x=1
检验:x=1是增根
∴方程没有解