问题
解答题
化简3x2-[7x-5(4x-3)-2x2].
答案
3x2-[7x-5(4x-3)-2x2]
=3x2-[7x-20x+15-2x2]
=3x2-7x+20x-15+2x2
=5x2+13x-15;
化简3x2-[7x-5(4x-3)-2x2].
3x2-[7x-5(4x-3)-2x2]
=3x2-[7x-20x+15-2x2]
=3x2-7x+20x-15+2x2
=5x2+13x-15;