问题
解答题
计算. (1)(-15)×9
(2)(-24
|
答案
(1)原式=-15×(9+
)=-15×9-15×14 15
=-135-14=-149;14 15
(2)原式=(24+
)×2 3
=24×3 2
+3 2
×2 3
=36+1=37.3 2
计算. (1)(-15)×9
(2)(-24
|
(1)原式=-15×(9+
)=-15×9-15×14 15
=-135-14=-149;14 15
(2)原式=(24+
)×2 3
=24×3 2
+3 2
×2 3
=36+1=37.3 2