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

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

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

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

(1)3x^y-[7x-4(x^y+2x-3)]
=3x^y-[7x-4x^y+8x-12]
=3x^y+7x+4x^y-8x+12
=7x^Y-x+12
(2)a-1/4(1-2/3a)-1/3(2-1/4a)
=a-1/4+1/6a-2/3+1/12a
=5/4a-11/12