解答如下:
2x²+6=7x2x²-7x+6=02(x²-7x/2+49/16) -49/8 +6=02(x-7/4)²=49/8 -48/82(x-7/4)²=1/8(x-7/4)²=1/16两边开平方:x-7/4=±1/4x=(7±1)/4解得:x1=2,x2=3/2
2x∧2-7x+6=0(2x-3)(x-2)=0