(3a-2b)(3a+2b)-(2a-3b)化简1.-x(x-y)+(x-y)(x+xy+y) 化简 2.(x-2xy)x-(9xy-12x的四次方y)÷3xy 3.已知m-0.5m=6求(m+0.5m) 4.试证(2n+1)-1能被8整除(n为自然数) 5.已知a,b,c分别是△ABC的三边,说明:(a+b-c)-4ab<0

问题描述:

(3a-2b)(3a+2b)-(2a-3b)
化简1.-x(x-y)+(x-y)(x+xy+y) 化简 2.(x-2xy)x-(9xy-12x的四次方y)÷3xy 3.已知m-0.5m=6求(m+0.5m) 4.试证(2n+1)-1能被8整除(n为自然数) 5.已知a,b,c分别是△ABC的三边,说明:(a+b-c)-4ab<0

(3a-2b)(3a+2b)-(2a-3b)=9a-4b-4a+12ab-9b=5a+12ab-13b 1.-x(x-y)+(x-y)(x+xy+y)=-x(x-2xy+y)+x-y=2xy-2y 2、(x-2xy)x-(9xy-12x的四次方y)÷3xy=x-2xy-3xy+4xy 3、m=12 则(m+0.5m) =18 =324 4、(2n+1)-1=4n+4n...