计算:3x^y-[7x-4(x^y+2x-3)] 计算:a-1/4(1-2/3a)-1/3(2-1/4a)

问题描述:

计算:3x^y-[7x-4(x^y+2x-3)] 计算:a-1/4(1-2/3a)-1/3(2-1/4a)

3x^y-[7x-4(x^y+2x-3)]
=3x^y-7x+4x^y+8x-12
=7x^y+x-12