已知:x+y=-봀,x-y=-7⼀2,求x-2(1⼀4x-1⼀3y눀)+(-3⼀2x+1⼀3y눀)的值

已知:x+y=-봀,x-y=-7/2,求x-2(1/4x-1/3y눀)+(-3/2x+1/3y눀)的值
2025-01-05 16:45:16
推荐回答(2个)
回答1:

解:题意得
x=-2 y=3/2
∴原式=x-1/2x+2/3y^2-3/2x+1/3y^2=-x+y^2=2+9/4=4.25

回答2:

先将待求表达式化简,然后代入x y的值即可!