49x^4+4y^4/7x^3y+2xy^3,其中7x=2y
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49x^4+4y^4/7x^3y+2xy^3,其中7x=2y
49x^4+4y^4/7x^3y+2xy^3,其中7x=2y
49x^4+4y^4/7x^3y+2xy^3,其中7x=2y
∵y=7x/2
∴ 49x^4+4y^4/7x^3y+2xy^3
=﹙49x^4+4y^4﹚/﹙7x^3y+2xy^3﹚
=﹙49+49²/4﹚/﹙49/2+7³/4﹚
=53/9
不明白符号是什么意思 不知道是乘以还是次幂
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