(6a²-2ab)-2(3a²+4ab-1/2b²),其中,A=1/5,b=-1

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(6a²-2ab)-2(3a²+4ab-1/2b²),其中,A=1/5,b=-1

(6a²-2ab)-2(3a²+4ab-1/2b²),其中,A=1/5,b=-1
(6a²-2ab)-2(3a²+4ab-1/2b²),其中,A=1/5,b=-1

(6a²-2ab)-2(3a²+4ab-1/2b²),其中,A=1/5,b=-1
(6a²-2ab)-2(3a²+4ab-1/2b²)
=6a²-2ab-6a²-8ab+b²
=-10ab+b²
=-10×1/5×(-1)+(-1)²
=2+1
=3

原式=6a²-2ab-6a²-8ab+b²
=-10ab+b²
=-10×1/5×(-1)+(-1)²
=3