问题
解答题
-42×
|
答案
-42×
+16×3 7
-16×1 3 4 7
=-16×
+16×3 7
-16×1 3 4 7
=-16×(
+3 7
-4 7
)1 3
=-16×2 3
=-
.32 3
-42×
|
-42×
+16×3 7
-16×1 3 4 7
=-16×
+16×3 7
-16×1 3 4 7
=-16×(
+3 7
-4 7
)1 3
=-16×2 3
=-
.32 3