化简求值5a²+3b²+2(a²-b²)-(5a²-3b²)其中丨a+1丨+(b-½)²=0 还有十分钟
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化简求值5a²+3b²+2(a²-b²)-(5a²-3b²)其中丨a+1丨+(b-½)²=0还有十分钟化简求值5a
化简求值5a²+3b²+2(a²-b²)-(5a²-3b²)其中丨a+1丨+(b-½)²=0 还有十分钟
化简求值5a²+3b²+2(a²-b²)-(5a²-3b²)其中丨a+1丨+(b-½)²=0
还有十分钟
化简求值5a²+3b²+2(a²-b²)-(5a²-3b²)其中丨a+1丨+(b-½)²=0 还有十分钟
5a²+3b²+2(a²-b²)-(5a²-3b²)
=5a²+3b²+2a²-2b²-5a²+3b²
=2a²+4b²
=2×1+4×1/4
=2+1
=3
等于3,a=-1,b=½
等于3 啊啊
由第二个式子:a=-1,b=1/2
第一个化简=2a^2+4b^2
带入=2+1=3
原式=2a²+4b²
a=-1 b=½
原式=2a²+4b² =2+1=3
由题意得a=-1 b=1/2
所以原式= 6b^2+2a^2-b^2
=5b^2+2a^2
=5*0.5*0.5+2*1
=3.25