问题
解答题
(1)-
(2)(
(3)(
|
答案
(1)-
×1 2
×(-7 8
)=3 4
;21 64
(2)(
-1 3
)÷11 2
÷1 4 1 10
=-
×1 6
×104 5
=-
;4 3
(3)(
-7 4
-7 8
)÷(-7 12
)+(-7 8
)8 3
=-
×7 4
+8 7
×7 8
+8 7
×7 12
+(-8 7
)8 3
=-2+1+
-2 3 8 3
=-2+1-2
=-3.