问题
解答题
计算: (1)(-1)2×23-(-4)÷2;(2)25×
|
答案
(1)(-1)2×23-(-4)÷2
=1×8+4×1 2
=8+2
=10;
(2)25×
-(-25)×3 4
+25×(-1 2
)1 4
=25(
+3 4
-1 2
)1 4
=25×1
=25.
计算: (1)(-1)2×23-(-4)÷2;(2)25×
|
(1)(-1)2×23-(-4)÷2
=1×8+4×1 2
=8+2
=10;
(2)25×
-(-25)×3 4
+25×(-1 2
)1 4
=25(
+3 4
-1 2
)1 4
=25×1
=25.