2X+Y=6,
X-3Y=1
解缺庆衫得:y=4/差判7
7Y(X-3Y)^2-2(3Y-X)^3
=7y*1^2-2*(-1)^3
=7y+2
=7*4/伏腔7+2
=6
2X+Y=6,
X-3Y=1
解伏腔得:y=4/缺庆衫7
7Y(X-3Y)^2-2(3Y-X)^3
=7y*1^2-2*(-1)^3
=7y+2
=7*4/差判7+2
=6
不仿桐解世旦方程组备返坦
(X-3Y)^2-2(3Y-X)^3
=7Y(3Y-X)^2-2(3Y-X)^3
=(3Y-X)^2[7Y-2(3Y-X)]
=(3Y-X)^2(7Y-6y+2X)
=(3Y-X)^2(2X+Y)
=6(-1)^2
=6