答案
解:(1)原式=-3+6-11+9=-14+15=1;
(2)原式=-4×7+3×6+8=-28+18+8=-2;
(3)原式=-
×(-9×
-2)=-
×(-6)=
;
(4)原式=-1-0.5×
×(-7)=-1+
=
;
(5)原式=a-3a-b+a-5b=-3a-6b;
(6)原式=5abc-2a
2b-[3abc-(12ab
2+3a
2b)]
=5abc-2a
2b-(3abc-12ab
2-3a
2b)
=5abc-2a
2b-3abc+12ab
2+3a
2b
=2abc+12ab
2+a
2b.
解:(1)原式=-3+6-11+9=-14+15=1;
(2)原式=-4×7+3×6+8=-28+18+8=-2;
(3)原式=-
×(-9×
-2)=-
×(-6)=
;
(4)原式=-1-0.5×
×(-7)=-1+
=
;
(5)原式=a-3a-b+a-5b=-3a-6b;
(6)原式=5abc-2a
2b-[3abc-(12ab
2+3a
2b)]
=5abc-2a
2b-(3abc-12ab
2-3a
2b)
=5abc-2a
2b-3abc+12ab
2+3a
2b
=2abc+12ab
2+a
2b.