Question

1.长方形的长为4a-3b,宽比长短a-b,那么这个长方形的周长是多少

Answer 1

1.14a-10b

2.A+B=-x³+3x²-2x-3

2(A-B)=-x³+x²-4x+1

2A-[B-(B-A)]=-x³+2x²-3x-1

3.f(x)=4.5x^n+5

4.|5-4a|+|a-6|=11-5a

|2x+3|-|4-2x|=7

5.C=x^n-2x^2n-5

6.=-1/2