问题 解答题
计算:
(1)9+(-1.4)-(+6)-(-1
2
5
);
(2)(-12)×(
3
4
+
5
6
-1
);
(3)(-
1
2
)×5+(-5)×(-
1
4
)+5×(-
3
4
)

(4)5+36÷(-3)2×(-
1
2
)-(-1)2013
答案

(1)原式=9-1.4-6+1

2
5

=9-6+1

2
5
-1.4

=3;

(2)原式=(-12)×

3
4
+(-12)×
5
6
-(-12)×1

=-9-10+12

=-19+12

=-7;

(3)原式=(-5)×(

1
2
-
1
4
+
3
4

=(-5)×1

=-5;

(4)原式=5+36÷9×(-

1
2
)-(-1)

=5+4×(-

1
2
)+1

=5-2+1

=4.

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