ab+a+b+1

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ab+a+b+1ab+a+b+1ab+a+b+1ab+a+b+1=a(b+1)+(b+1)=(a+1)(b+1)ab+a+b+1=a(b+1)+b+1=(b+1)(a+1)ab+a+b+1=(ab+a

ab+a+b+1
ab+a+b+1

ab+a+b+1
ab+a+b+1
=a(b+1)+(b+1)
=(a+1)(b+1)

ab+a+b+1
=a(b+1)+b+1
=(b+1)(a+1)

ab+a+b+1
=(ab+a)+(b+1)
=a(b+1)+(b+1)
=(b+1)(a+1)
或者
ab+a+b+1
=(ab+b)+(a+1)
=b(a+1)+(a+1)
=(a+1)(b+1)