
计算:(1)12×(12?56+34);(2)?23?(?3)2÷95+(?1)20
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(1)12×(
?
+
)
解法一:原式=12×
?12×
+12×
=6-10+9
=5.
解法二:原式=12×(
?
+
)
=12×
=5.
(2)?23?(?3)2÷
+(?1)20
=?8?9÷
+1
=?8?9×
+1
=-8-5+1
=-12.
1 |
2 |
5 |
6 |
3 |
4 |
解法一:原式=12×
1 |
2 |
5 |
6 |
3 |
4 |
=6-10+9
=5.
解法二:原式=12×(
6 |
12 |
10 |
12 |
9 |
12 |
=12×
5 |
12 |
=5.
(2)?23?(?3)2÷
9 |
5 |
=?8?9÷
9 |
5 |
=?8?9×
5 |
9 |
=-8-5+1
=-12.
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