问题
解答题
35×80=35×2×40=2800.______.
答案
35×80,
=35×(2×40),
=(35×2)×40,
=70×40,
=2800.
所以,35×80=35×2×40=2800是正确的,
故答案为:正确.
35×80=35×2×40=2800.______.
35×80,
=35×(2×40),
=(35×2)×40,
=70×40,
=2800.
所以,35×80=35×2×40=2800是正确的,
故答案为:正确.