计算:(1)-13+514-317-514+1267;(2)3.75-(-12)+(-423)+(-0.5)+(-634);(3)325+(-278)+(-3512)+535+(-118)+5512;(4)(-458)+(-3.75)+(-238)+(-314);(5)(-123)+313+(-414)-数学
=25×(
3 |
4 |
1 |
4 |
=25;
(7)(-3)2÷2
1 |
4 |
2 |
3 |
1 |
3 |
=9×
4 |
9 |
4 |
9 |
1 |
3 |
=
16 |
9 |
4 |
3 |
=
64 |
9 |
(8)(-79)÷2
1 |
4 |
4 |
9 |
=(-79)×
4 |
9 |
4 |
9 |
=(-79-29)×
4 |
9 |
=-108×
4 |
9 |
=-48;
(9)[30-(
7 |
9 |
5 |
6 |
11 |
12 |
=[30-(
7 |
9 |
5 |
6 |
11 |
12 |
=[30-28-30+33]÷(-5)
=5÷(-5)
=-1;
(10)(-1)3-(1-
1 |
2 |
=-1-
1 |
2 |
1 |
3 |
=-1-
1 |
2 |
1 |
3 |
=-1+1
=0;
(11)(
1 |
4 |
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