问题
解答题
计算 (1)12-(-18)+(-7)-15 (2)(-
|
答案
(1)原式=12+18-7-15
=30-22
=8;
(2)原式=(-
-3 4
+5 6
)×247 12
=-
×24-3 4
×24+5 6
×247 12
=-18-20+14
=-24.
计算 (1)12-(-18)+(-7)-15 (2)(-
|
(1)原式=12+18-7-15
=30-22
=8;
(2)原式=(-
-3 4
+5 6
)×247 12
=-
×24-3 4
×24+5 6
×247 12
=-18-20+14
=-24.