合并同类项.(1)5(2x-7y)-3(4x-10y);(2)(5a-3b)-3(a2-2b);(3)3(3a2-2ab)-2(4a2-ab);(4)2x-[2
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合并同类项. (1)5(2x-7y)-3(4x-10y); (2)(5a-3b)-3(a2-2b); (3)3(3a2-2ab)-2(4a2-ab); (4)2x-[2(x+3y)-3(x-2y)]. |
答案
(1)5(2x-7y)-3(4x-10y)=10x-35y-12x+30y=-2x-5y; (2)(5a-3b)-3(a2-2b)=5a-3b-3a2+6b=5a-3a2+3b; (3)3(3a2-2ab)-2(4a2-ab)=9a2-6ab-8a2+2ab=a2-4ab; (4)2x-[2(x+3y)-3(x-2y)]=2x-(-x+12y)=3x-12y. |
举一反三
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