16=x(8-x)16=8x-x²x²-8x+16=0(x-4)²=0得x=4
16=x(8-x)x²-8x+16=0(x-4)²=0x-4=0x=4
16=x(8-x)16=8x-x²(x-4)²=0即x-4=0所以x=4
