问题标题:
1.求2a^2-4a1和-3a^22a-5的差.2.求5(3a^2-ab^2)-4(-ab^23a^b)的值,其中a=2,b=36.已知a^2+5ab=6,3b^2+2ab=8,求代数式a^2+11ab9b^2的值.3.化简(1)(x^2+5xy-y^2)-(x^2+3xy-2y^2)(2)-(2x-3y+7)+2(6x-5y-2)(3)5(x+y)-4(3x-2y)+3(2x-3y)(4)-2(8m^2
问题描述:
1.求2a^2-4a1和-3a^22a-5的差.
2.求5(3a^2-ab^2)-4(-ab^23a^b)的值,其中a=2,b=3
6.已知a^2+5ab=6,3b^2+2ab=8,求代数式a^2+11ab9b^2的值.
3.化简
(1)(x^2+5xy-y^2)-(x^2+3xy-2y^2)
(2)-(2x-3y+7)+2(6x-5y-2)
(3)5(x+y)-4(3x-2y)+3(2x-3y)
(4)-2(8m^2n^2-3m^2)-5m^2n^2-3(-3m^2n^22m^2)中间空格是加号
查杰民回答:
求2a^2-4a1和-3a^22a-5的差.2a^2-4a+1-(-3a^2+2a-5) =2a^2-4a+1+3a^2-2a+5 =5a^2-6a+52.求5(3a^2-ab^2)-4(-ab^23a^b)的值,其中a=2,b=3 5(3a^2-ab^2)...
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