(2)已2.计算与化简:(第⑴计算:-2X(—3)+(—48)—6;1.化简或求值1)化简:(2m一3n+7)一(-6m+5n+2)=0,求4xy-[(x2+5xy一y2)-(x2+3xy)]的值。1)(2)(3)题每题4分,第(4)题6分,共18分)2)计算:(3)化简:2(3x2-2xy)-4(2x2-xy-1);(4)先化简,...
时间:2024-11-11 13:08栏目:行业资料