a: \(\left(3x-1\right)\left(2x+7\right)-\left(12x^3+8x^2-14x\right):2x\)
\(=6x^2+21x-2x-7-\left(6x^2+4x-7\right)\)
\(=6x^2+19x-7-6x^2-4x+7\)
=15x
b: \(B=\dfrac{63^3-37^3}{26}+63\cdot37\)
\(=63^2+63\cdot37+37^2+63\cdot37\)
=10000
Đúng 1
Bình luận (0)