解方程1.x(2x+7)=3(2x+7) 2.3/2x²-4x=1 3.x（3x-4）-7=2（x²

1。x(2x+7)=3(2x+7) x(2x+7)-3(2x+7) =0(2x+7)(x-3)=0x=-7/2 x=32。3/2x²-4x=1 3x²-8x-2=0x²-8x/3=2/3x²-8x/3+16/9=2/3+16/9(x-4/3)²=22/9x=4/3+√22/3 x=4/3-√22/33。x（3x-4）-7=2（x²-2）+2x3x²-4x-7=2x²-4+2xx²-6x-3=0x²-6x+9=12(x-3)²=12x=3+2√3 x=3-2√3