-x+3y=5求5(X-3Y)²-8(x-3y)-5等于多少/
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-x+3y=5求5(X-3Y)²-8(x-3y)-5等于多少/
-x+3y=5求5(X-3Y)²-8(x-3y)-5等于多少/
-x+3y=5求5(X-3Y)²-8(x-3y)-5等于多少/
-x+3y=5
x-3y=-5
5(X-3Y)²-8(x-3y)-5
=5x(-5)²-8x(-5)-5
=125+40-5
=165-5
=160
不懂的欢迎追问...
5(X-3Y)²-8(x-3y)-5
=5*(-5)²-8*(-5)-5
=125+40-5
=160