问题 解答题
计算:
(1)(-7)+(-2)
(2)(-3)+(-4)-(+11)-(-19)
(3)-14+8÷(-2)2-(-4)×(-3)
(4)25×
3
4
-(-25)×
1
2
+25×(-
1
4
答案

(1)原式=-9;

(2)原式=-3-4-11+19

=-18+19

=1;

(3)原式=-1+8÷4-12

=-1+2-12

=-11;

(4)原式=25×

3
4
+25×
1
2
+25×(-
1
4

=25(

3
4
+
1
2
-
1
4

=25

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