计算题(1)3y2-x2+(2x-y)-(x2+3y2)(2)(x3y+xy2)-2(x3y-2xy2)
题型:解答题难度:一般来源:不详
计算题 (1)3y2-x2+(2x-y)-(x2+3y2) (2)(x3y+xy2)-2(x3y-2xy2) |
答案
(1)原式=3y2-x2+2x-y-x2-3y2 =3y2-3y2-x2-x2+2x-y =-2x2+2x-y;
(2)原式=x3y+xy2-2x3y+4xy2 =x3y-2x3y+xy2+4xy2 =5xy2-x3y. |
举一反三
下列变形正确的是( )A.2a2+5a3=7a5 | B.3t3-t3=3 | C.3x+2y=5xy | D.2x2y-2yx2=0 |
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