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:四川省期末题
合并同类项: (1)5xy2+2x2y﹣3xy2﹣x2y (2)﹣2x+5(x+2y)﹣(x﹣3y) |
答案
解:(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
下列合并同类项,结果正确的是 |
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A.a2﹣3a2=﹣2a2 B.3a﹣a=2 C.3a+b=3ab D.a+3a=3a2 |
下列合并同类项正确的有 |
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A.2x+4x=8x2 B.3x+2y=5xy C.7x2﹣3x2=4 D.9a2b﹣9ba2=0 |
合并同类项 (1)-a+2a+3a+1 (2)2a-3b+4﹣2a+5b-2 (3)2ax+3by-4xa+3by﹣2ax (4)3x2y-xy2-2x2y+3xy2 |
下列合并同类项正确的有 |
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A.2x+4x=8x2 B.3x+2y=5xy C.7x2-3x2=4 D.9a2b-9ba2=0 |
合并同类项:①a﹣2a﹣4a=( ),②a2﹣2(ab﹣b2)﹣b2=( ). |
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