去括号练习七年级数学试卷
日期:2010-12-13 12:54
与a-b-c的值不相等的是()A.a-(b+c)B.a-(b-c)C.(a-b)+(-c)D.(-c)+(-b+a)2.化简-[0-(2p-q)]的结果是()A.-2p-qB.-2p+qC.2p-qD.2p+q3.下列去括号中,正确的是()A.a-(2b-3c)=a-2b-3cB.x3-(3x2+2x-1)=x3-3x2-2x-1C.2y2+(-2y+1)=2y2-2y+1D.-(2x-y)-(-x2+y2)=-2x+y+x2+y24.去括号:a+(b-c)=;(a-b)+(-c-d)=;-(a-b)-(-c-d)=;5x3-[3x2-(x-1)]=.5.判断题.(1)x-(y-z)=x-y-z()(2)-(x-y+z)=-x+y-z()(3)x-2(y-z)=x-2y+z()(4)-(a-b)+(-c-d)=-a+b+c+d()6.去括号:-(2m-3);n-3(4-2m);16a-8(3b+4c);-(x+y)+(p+q);-8(3a-2ab+4);4(rn+p)-7(n-2q).7.先去括号,第7课时去括号(1)1.下列各式中,再合并同类项:-2n-(3n-1);a-(5a-3b)+(2b-a);-3(2s-5)+6s;1-(2a-1)-(3a+3);3(-ab+2a)-(3a-b);14(abc-2a)+3(6a-2abc).8.,
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