七年级数学整式的加减之易错点测试

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1、七年级数学整式的加减之易错点测试一、单选题(共10道，每道10分)1.化简6x2+9x-1-(x-2x2-1)+2的结果为()A.B. C.D. 2.化简的结果为()A.B. C.D. 3.化简(2a2-1+2a)-3(a-1+a2)的结果为()A.B. C.D. 4.化简3a2-2(3a2+a)+2(a2-3a+1)的结果为()A.B.-a2-4a+2 C.-a2-4a+1D. 5.化简的结果为()A.2a2+2abB. C.a2+2abD. 6.化简的结果为()第3页共3页A.4xB.-4x C.-3x-1D.-6x 7.化简5a3-2a2+a-2(a3-3a2)-1的结果为()A.3a3

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