问题 解答题
计算.
(1)(-15)×9
14
15
;          
(2)(-24
2
3
)×(-1
1
2
)
答案

(1)原式=-15×(9+

14
15
)=-15×9-15×
14
15
=-135-14=-149;

(2)原式=(24+

2
3
)×
3
2
=24×
3
2
+
2
3
×
3
2
=36+1=37.

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