67×1/4+21/2×3.75−41/2×25%=_.
问题描述:
67×
+21 4
×3.75−41 2
×25%=______. 1 2
答
67×
+21 4
×3.75-41 2
×25%1 2
=67×
+21 4
×31 2
-43 4
×1 2
1 4
=(67-4
)×1 2
+1 4
×5 2
15 4
=
×125 2
+1 4
75 8
=
+125 8
75 8
=25
故答案为:25.