(3a+1)(2a-3)-6(a-1)(a+2)

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(3a+1)(2a-3)-6(a-1)(a+2)(3a+1)(2a-3)-6(a-1)(a+2)(3a+1)(2a-3)-6(a-1)(a+2)(3a+1)(2a-3)-6(a-1)(a+2)=6a^

(3a+1)(2a-3)-6(a-1)(a+2)
(3a+1)(2a-3)-6(a-1)(a+2)

(3a+1)(2a-3)-6(a-1)(a+2)
(3a+1)(2a-3)-6(a-1)(a+2)
=6a^2-7a-3-6(a^2+a-2)
=6a^2-7a-3-6a^2-6a+12
=-13a+9

(3a+1)(2a-3)-6(a-1)(a+2)
=6a²-9a+2a-3-6(a²+2a-a-2)
=6a²-9a+2a-3-6a²-6a+12
=-13a+9

(3a+1)(2a-3)-6(a-1)(a+2)
展开试式或得:6a^2-9a+2a-3-6(a^2+2a-a-2)=6a^2-9a+2a-3-6a^2-12a+6a+12=-13a+9=-3*13+9=-30