5X²-3Y²-(X²-Y²)-2(X²+4Y²)其中|X+2|+(Y+3)²=0,求值
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5X²-3Y²-(X²-Y²)-2(X²+4Y²)其中|X+2|+(Y+3)²=0,求值
5X²-3Y²-(X²-Y²)-2(X²+4Y²)其中|X+2|+(Y+3)²=0,求值
5X²-3Y²-(X²-Y²)-2(X²+4Y²)其中|X+2|+(Y+3)²=0,求值
|X+2|+(Y+3)²=0
x+2=0 x=-2
y+3=0 y=-3
5X²-3Y²-(X²-Y²)-2(X²+4Y²)
=5x²-3y²-x²+y²-2x²-8y²
=2x²-10y²
=2x2²-10x3²
=8-90
=-82