问题
解答题
计算: (1)(+
(2)(-
(3)0-(-2)-(+7). |
答案
(1)原式=
+1 4
=1;3 4
(2)原式=-
+(-1 3
)=-(2 3
+1 3
)=-1;2 3
(3)原式=0+2+(-7)=-5.
计算: (1)(+
(2)(-
(3)0-(-2)-(+7). |
(1)原式=
+1 4
=1;3 4
(2)原式=-
+(-1 3
)=-(2 3
+1 3
)=-1;2 3
(3)原式=0+2+(-7)=-5.