已知3a^y+4b^3x-1与-3a^2xb^1-2y是同类项,求x^2-y^2

因为 3a^y+4b^3x-1与-3a^2xb^1-2y是同类项
所以
y+4=2x
①2x-y=4
3x-1=1-2y
②3x+2y=2
2①+②得
7x=8+2
7x=10
x=10/7
带入①
20/7-y=4
y=-8/7
x^2-y^2=(x+y)(x-y)=(10/7-8/7)(10/7+8/7)=36/49