脱式计算(能用简便方法计算的要用简便方法计算)185-25-75 6495-(495-299) 200×4+300 9999+999+9

2025-04-13 04:44:52
推荐回答(1个)
回答1:

(1)185-25-75 
=185-(25+75)
=185-100
=85;

(2)6495-(495-299)
=6495-495+299
=6000+299
=6299;

(3)200×4+300
=800+300
=1100;

(4)9999+999+99+9
=(10000-1)+(1000-1)+(100-1)+(10-1)
=(10000+1000+100+10)-(1+1+1+1)
=11110-4
=11106.