题目内容
请你先认真阅读材料:
计算(-
)÷(
-
+
-
)
解:原式的倒数是(
-
+
-
)÷(-
)
=(
-
+
-
)×(-30)
=
×(-30)-
×(-30)+
×(-30)-
×(-30)
=-20-(-3)+(-5)-(-12)
=-20+3-5+12
=-10
故原式等于-
再根据你对所提供材料的理解,选择合适的方法计算:
.
计算(-
1 |
30 |
2 |
3 |
1 |
10 |
1 |
6 |
2 |
5 |
解:原式的倒数是(
2 |
3 |
1 |
10 |
1 |
6 |
2 |
5 |
1 |
30 |
=(
2 |
3 |
1 |
10 |
1 |
6 |
2 |
5 |
=
2 |
3 |
1 |
10 |
1 |
6 |
2 |
5 |
=-20-(-3)+(-5)-(-12)
=-20+3-5+12
=-10
故原式等于-
1 |
10 |
再根据你对所提供材料的理解,选择合适的方法计算:
|
原式的倒数是:
(
-
+
-
)÷(-
)
=(
-
+
-
)×(-42)
=-(
×42-
×42+
×42-
×42)
=-(7-9+28-12)
=-14,
故原式=-
.
(
1 |
6 |
3 |
14 |
2 |
3 |
2 |
7 |
1 |
42 |
=(
1 |
6 |
3 |
14 |
2 |
3 |
2 |
7 |
=-(
1 |
6 |
3 |
14 |
2 |
3 |
2 |
7 |
=-(7-9+28-12)
=-14,
故原式=-
1 |
14 |
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