(2b-3a) (4a-b)化简-搜答案-搜狗做题网

3a×4b-2a×4b/2-3a×b/2=12ab+4ab-1.5ab=16ab-1.5ab=14.5a

3a+4b-(2b+4a)化简

3a+4b-(2b+4a)=3a+4b-2b-4a=(3-4)a+(4-2)b=-a+2b再问：若A=x-5y，B=y+5x，则2A-3B的值是多少再答：2A-3B=2(x-5y)-3(y+5x)=2

{[(2a-b)/(a+b)]-[b/(a-b)]}÷[(a-2b)/(a+b)]=(2a²-4ab)/[(a+b)(a-b)]×(a+b)/(a-2b)=(2a²-4ab)/(a

分母分子都乘以(a+b)(a-b)(2a^2-3ab+b^2-ab-b^2)/(a^2-3ab-2b^2)(2a^2-4ab)/((a-2b)(a-b))2a(a-2b)/((a-2b)(a-b))2

1.（a-b)^2（b-a)^3(a-b)^-4=(a-b)^2*(b-a)^3*1/(a-b)^4=(b-a)^2*(b-a)^3*1/(b-a)^4=(b-a)^5/(b-a)^4=b-a2.(-

化简 |a+b|-|3a-2b|

应该是a

5(2a-2b)+4(2b-3a)=10a-10b+8b-12a=-2a-2b再问：奇怪了但是答案是3a-2b再答：这个题我的答案没错，你的答案错了，你自己代入看一下么

4(b-a)(a+b)-(2a-3b)(3a-2b)=4(b²-a²)-(6a²-4ab-9ab+6b²)=4b²-4a²-6a²

：((a+b)(a-b)-(a-b)^2+2b(a-b))/4(a-b)=(a-b)[(a+b)-(a-b)+2b]/4(a-b)=(a-b)[2b+2b]/4(a-b)=

=24*(a+2b)^4

[(4a+3b)(4a-3b)-(3a+3b)(2a-3b)]/5a=[16a^2-9b^2-6a^2+9ab-6ab+9b^2]/5a=[10a^2+3ab]/5a=2a+3b/5

5（a-2b+c）-4(-a+b-c)+4(3a-2b)=5a-10b+5c+4a-4b+4c+12a-8b=(5a+4a+12a)+(-10b-4b-8b)+(5c+4c)=21a-22b+9c

a^2b*3ab+5a^2b@4ab=a^2b+3ab+5a^2b-4ab,=6a^2b-ab=ab(6a-1)=5*3*(6*5-1)=435

【2a-b】【2a+b】-【-3a+2b】【-3a-2b】=4a²-b²-9a²+4b²=-5a²+3b²

1÷(3b/3a÷4b/9a×3a/2b)=1÷(3b/3ax9a/4b×3a/2b)=1÷(9/4x3a/2b)=1÷27a/8b=8b/27a

原式=12ab-4ab-(3a+b)/2=8ab-3a/2-b/2

(a+b)(a-b)-(3a-2b)(3a+2b)=（a²-b²）-（9a²-4b²）平方差公式=a²-b²-9a²+4b

(2a-b/a+b-b/a-b)除以a-2b/a+b=[(2a-b)(a-b)-b(a+b)]/(a+b)(a-b)x(a+b)/(a-2b)=(2a²-3ab+b²-ab-b&#

再问：不懂再答：因为(a-b)平方和(b-a)平方是相等的

(a+b)^2+2a(a-1/2b)-3(a-b)(a+b)=a^2+2ab+b^2+2a^2-ab-3a^2+3b^2=ab+4b^2=b(a+4b)