若m﹣(﹣3x)=2x2﹣3x﹣3,那么m应该是 [ ]A.2x2﹣3B.2x2﹣3x﹣3C.2x2﹣6x﹣3D.2x2﹣9x﹣3
题型:单选题难度:一般来源:辽宁省期中题
若m﹣(﹣3x)=2x2﹣3x﹣3,那么m应该是 |
[ ] |
A.2x2﹣3 B.2x2﹣3x﹣3 C.2x2﹣6x﹣3 D.2x2﹣9x﹣3 |
答案
C |
举一反三
(1)计算:﹣3×(﹣2)2+[(﹣3)×2]2; (2)计算:![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817185125-57627.png) (3)5x4+3x2y﹣1﹣3x2y﹣6x4+2 (4)3( x2y+xy2 )﹣(3x2 y﹣1)﹣3xy2 |
计算 (1)(﹣49)﹣(+91)﹣(﹣5)+(﹣9) (2)13+7﹣(﹣20)﹣(﹣40)﹣6 (3)(﹣5)×(﹣7)﹣5×(﹣6) (4)![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817185122-88680.png) (5)﹣22﹣(﹣1)2009×( ﹣ )÷ +(﹣3)2 (6)3(2x2﹣y2)﹣2(3y2﹣2x2) (7)﹣(5x+y)﹣3(x﹣3y) (8)1﹣(3xy+x)+[﹣(2x﹣3yx)]. |
先化简,再求值:(5a2﹣3b2)+(a2﹣b2)﹣(5a2+2b2),其中a=﹣1,b=1. |
(1)一个多项式减去5mn+3m2得﹣2n2﹣4mn,求这个多项式. (2)已知(x﹣2)2+|y+1|=0,求5xy2﹣[2x2y﹣(3xy2﹣2x2y)]的值. |
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