问题
解答题
计算 (1)23-17-(-7)+(-16) (2)26×
(3)(
(4)-3×(-
|
答案
(1)原式=23-17+7-16=6+7-16=13-16=-3;
(2)原式=26×(
-5 8
+1 8
)=26×(1 4
+2 4
)=26×1 4
=3 4
;39 2
(3)原式=(
-1 4
-1 9
)×(-36)×(-1 12
)=(1 2
-1 4
-1 9
)×18=1 12
-2-=9 2
=1;3 2
(4)原式=-3×
-4×(-4 9
)-8÷(-1 3
)=-8 27
+4 3
+8×4 3
=27.27 8