3a-1{-2b+[a-(4a-3b)]},其中a=-1,b=3
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3a-1{-2b+[a-(4a-3b)]},其中a=-1,b=33a-1{-2b+[a-(4a-3b)]},其中a=-1,b=33a-1{-2b+[a-(4a-3b)]},其中a=-1,b=33a-1
3a-1{-2b+[a-(4a-3b)]},其中a=-1,b=3
3a-1{-2b+[a-(4a-3b)]},其中a=-1,b=3
3a-1{-2b+[a-(4a-3b)]},其中a=-1,b=3
3a-1{-2b+[a-(4a-3b)]}
=3a-1{-2b+[a-4a+3b]}
=3a-1{-2b+[-3a+3b]}
=3a-1{-2b-3a+3b}
=3a-1(-3a+b)
=3a+3a-b
=6a-b
=6*(-1)-3
=-6-3
=-9
=-3-1{-6+[-1-(-4-9)]}=-3-(-6+12)=-9
-3-1{-6+【-1-（-4-9）】}
=-3-1{-6-(-1+13)}
=-3-1{-6+12}
=-3-1*6
=-9
-24
=-9
-9