Question

Rút gọn các biểu thức :

a)5(x-2)+2(x+3)

b)(x+1)^2-(x-5)(x+2)

c)(x+7)(x-7)-(x-1)(x+1)

d)(x+5)^2+x(2x+5)^2.(2x+5)(2x-1)

Answer 1

\(a,=5x-10+2x+6=7x-4\\ b,=x^2+2x+1-x^2+3x+10=5x+11\\ c,=x^2-49-x^2+1=-48\\ d,\text{Đề có sai ko vậy?}\)