合并同类项(1)5xy2+2x2y-3xy2-x2y (2)-2x+5(x+2y)-(x-3y)
题型:解答题难度:一般来源:不详
合并同类项 (1)5xy2+2x2y-3xy2-x2y (2)-2x+5(x+2y)-(x-3y) |
答案
(1)5xy2+2x2y-3xy2-x2y=5xy2-3xy2+2x2y-x2y=2xy2+x2y;
(2)-2x+5(x+2y)-(x-3y)=-2x+5x+10y-x+3y=2x+13y. |
举一反三
下列运算正确的是( )A.4x-6x=2x | B.-a-a=0 | C.x3-x2=x | D.2xy-3xy=-xy |
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已知xm+2y和-3x2yn是同类项,则m、n的值分别是( )A.m=1,n=0 | B.m=2,n=1 | C.m=1,n=2 | D.m=0,n=1 |
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