解方程:log_3(2x*2-6x-7)=:log_3(x*2+2x-22)
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解方程:log_3(2x*2-6x-7)=:log_3(x*2+2x-22)
![解方程:log_3(2x*2-6x-7)=:log_3(x*2+2x-22)](/uploads/image/z/17832608-8-8.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%3Alog_3%282x%2A2-6x-7%29%3D%3Alog_3%28x%2A2%2B2x-22%29)
log_3(2x^2-6x-7)=log_3(x^2+2x-22)
2x^2-6x-7=x^2+2x-22
x^2-8x+15=0
x=3 或者 x=5
当x=3时,2x^2-6x-7=-70,符合
2x^2-6x-7=x^2+2x-22
x^2-8x+15=0
x=3 或者 x=5
当x=3时,2x^2-6x-7=-70,符合
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(log_4 3+log_8 3)(log_3 2+log_ 9 2)-log_2 4次根号32
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