一.先化简,再求值.(-x2+5+4x)+(5x-4+2x2) 二.计算 (1) x2y-3x2y (2)10y2+0.5y2 (3)-1/2a2bc+1/2cba2 (4)1/4mn-1/3mn+7 (5)7ab-3a2b2+7+8ab2+3a2b2-3-7ab (6)3x3-3x2-y2+5y+x2-5y+y2 三.计算{难点} (1) (4a3b-10b3)+(-3a2b2+10b3) (2) (4x2y-5xy2)-(3x2y-

一.先化简,再求值.(-x2+5+4x)+(5x-4+2x2) 二.计算 (1) x2y-3x2y (2)10y2+0.5y2 (3)-1/2a2bc+1/2cba2 (4)1/4mn-1/3mn+7 (5)7ab-3a2b2+7+8ab2+3a2b2-3-7ab (6)3x3-3x2-y2+5y+x2-5y+y2 三.计算{难点} (1) (4a3b-10b3)+(-3a2b2+10b3) (2) (4x2y-5xy2)-(3x2y-
一.先化简,再求值.(-x2+5+4x)+(5x-4+2x2) 二.计算 (1) x2y-3x2y (2)10y2+0.5y2 (3)-1/2a2bc+1/2cba2 (4)1/4mn-1/3mn+7 (5)7ab-3a2b2+7+8ab2+3a2b2-3-7ab (6)3x3-3x2-y2+5y+x2-5y+y2 三.计算{难点} (1) (4a3b-10b3)+(-3a2b2+10b3) (2) (4x2y-5xy2)-(3x2y-4xy2) (3) 5a2-[a2+(5a2-2a)-2(a2-3a)] (4) (4a2b-3ab)+(-5a2b+2ab) (5) (6m2-4m-3)+(2m2-4m+1) (7) (5a2+2a-1)-4(3-8a+2a2)

一.先化简,再求值.(-x2+5+4x)+(5x-4+2x2) 二.计算 (1) x2y-3x2y (2)10y2+0.5y2 (3)-1/2a2bc+1/2cba2 (4)1/4mn-1/3mn+7 (5)7ab-3a2b2+7+8ab2+3a2b2-3-7ab (6)3x3-3x2-y2+5y+x2-5y+y2 三.计算{难点} (1) (4a3b-10b3)+(-3a2b2+10b3) (2) (4x2y-5xy2)-(3x2y-
就是,题有没有问题哦

x2+9x+1 -2x2y 10.5y2 0 7-1/12mn 4+8ab2 3x3-2x2 4a3b-3a2b2 x2y-xy2 a2-4a -ab-a2b 8m2-8m-2 -3a2+34a-13