(a-1)×( )=a²-2a+1咋做
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(a-1)×()=a²-2a+1咋做(a-1)×()=a²-2a+1咋做(a-1)×()=a²-2a+1咋做(a-1)×()=a²-2a+1a²-2a
(a-1)×( )=a²-2a+1咋做
(a-1)×( )=a²-2a+1咋做
(a-1)×( )=a²-2a+1咋做
(a-1)×( )=a²-2a+1
a²-2a+1=(a-1)*(a-1)
所以(a-1)×( a-1 )=a²-2a+1
a²-2a+1=(a-1)²
所以:?=(a-1)
(a-1)²=a²-2a+1
这是完全平方公式,要记的,直接应用就得:
(a-1)×(a-1)=a²-2a+1