问题
解答题
计算: (1)3
(2)(-5)×6+(-125)÷(-5) (3)-82+3×(-2)2+(-6)÷(-
(4)-2×(-
|
答案
(1)3
+(-1 2
)-(-1 2
)+21 3 2 3
=3
-1 2
+1 2
+21 3 2 3
=3+3
=6;
(2)(-5)×6+(-125)÷(-5)
=-30+25
=-5;
(3)-82+3×(-2)2+(-6)÷(-
)21 3
=-64+3×4+(-6)×9
=-64+12-54
=-106;
(4)-2×(-
)2+|-(-2)|3-(-1 2
).1 2
=-2×
+8+1 4 1 2
=-
+8+1 2 1 2
=8.