(4-x)(-4-x)-(x+12)(x+4)=18(x-4)(x+4)-(x+12)(x+4)=18x²-16-x²-16x-48=18-16x-64=1816x=-64-1816x=-82x=-82/16x=-41/8很高兴为您解答,【the 1990】团队为您答题.请点击下面的【选为满意回答】按钮....