a-b=3,ad=-1.(4a-5b-ab)-(2a-3b+5ab)的值

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a-b=3,ad=-1.(4a-5b-ab)-(2a-3b+5ab)的值

a-b=3,ad=-1.(4a-5b-ab)-(2a-3b+5ab)的值
a-b=3,ad=-1.(4a-5b-ab)-(2a-3b+5ab)的值

a-b=3,ad=-1.(4a-5b-ab)-(2a-3b+5ab)的值
(4a-5b-ab)-(2a-3b+5ab)
= 4a - 5b - ab - 2a + 3b - 5ab
= 2a - 2b - 6ab
=2(a-b) - 6ab
= 6 + 6
=12

(4a-5b-ab)-(2a-3b+5ab) = 2a-2b-6ab = 2(a-b)-6ab = 2X3-6X(-1)= 12

(5a-5b-ab)-a-(2a-3b+5ab)=(5a-5b-ab)-a-2a+3b-5ab=
(5a-5b-ab)-(3a-3b+5ab)=15+1-(9-5)=12