(1)原式=33-32+7+3
=11;
(2)原式=
5
12 ×(-12)+
2
3 ×(-12)-
3
4 ×(-12)
=-5-8+9
=-4;
(3)原式=-9÷3×(-
1
3 )-(-8)
=1+8
=9;
(4)原式=(1+3+1-3)x 2
=2x 2;
(5)原式=2a 2b-4ab 2+2c-2c-3a 2b+ab 2
=-a 2b-3ab 2.
(1)原式=33-32+7+3
=11;
(2)原式=
5
12 ×(-12)+
2
3 ×(-12)-
3
4 ×(-12)
=-5-8+9
=-4;
(3)原式=-9÷3×(-
1
3 )-(-8)
=1+8
=9;
(4)原式=(1+3+1-3)x 2
=2x 2;
(5)原式=2a 2b-4ab 2+2c-2c-3a 2b+ab 2
=-a 2b-3ab 2.