分子上提取公因式2a^3b^2,与分母的2a^3b^2约掉则
-(3a^2b^2-2ab+1)
=-(2a^2b^2+a^2b^2-2ab+1)
=-[2a^2b^2+(ab-1)^2]
=-[2(ab)^2+(ab-1)^2]
式中的a^2代表a的平方
分子上提取公因式2a^3b^2,与分母的2a^3b^2约掉则
-(3a^2b^2-2ab+1)
=-(2a^2b^2+a^2b^2-2ab+1)
=-[2a^2b^2+(ab-1)^2]
=-[2(ab)^2+(ab-1)^2]
式中的a^2代表a的平方