先化简再求值(5a²-3b²)+(a²+b²)-(5a²+3b²)其中a=-1 b=1
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先化简再求值(5a²-3b²)+(a²+b²)-(5a²+3b²)其中a=-1 b=1
先化简再求值(5a²-3b²)+(a²+b²)-(5a²+3b²)其中a=-1 b=1
先化简再求值(5a²-3b²)+(a²+b²)-(5a²+3b²)其中a=-1 b=1
原式=5a²-3b²+a²+b²-5a²-3b²
=a²-5b²
=(-1)²-5×1²
=1-5
=-4