62×[(392 598)÷4}如何简算?

2025-04-23 16:39:06
推荐回答(2个)
回答1:

解:依题意得算式,
62×[(392+598)÷4]
=62×990÷4
=31×2×(1000-10)÷4
=31×(1000-10)÷2
=31×1000÷2-31×10÷2
=15500-155
=15345
即62×[(392+598)÷4]=15345

回答2:

62×[(392+598)÷4]
=62×(990÷4)
=62÷4×990
=15.5×990
=155×99
=155×(100-1)
=155×100-155×1
=15500-155
=15345