句型转换
Howmuchdoesyournewcarcost?
1)_________doesyournewcar_________?
2)__________is____________________________yournewcar?
这个是数学的数与式的运算
(1/5m-1/2n)(1/25m^2+1/10m+1/4n^2)
(2a+1-b)^2-(a-b)(a+2b)
(X-1)(X-2)(X-3)(X-4)