a²+b²+c²-2a²b²-2a²c²-2b²c²怎么解?
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a²+b²+c²-2a²b²-2a²c²-2b²c²怎么解?
a²+b²+c²-2a²b²-2a²c²-2b²c²怎么解?
a²+b²+c²-2a²b²-2a²c²-2b²c²怎么解?
是个公式.a²+2ab+b²-2ac+c²-2bc
=(a²+2ab+b²)-(2ac+2bc)+c²
=(a+b)²-2c(a+b)+c²
=[(a+b)-c]²
=(a+b-c)²