题目内容
【题目】脱式计算,能简算的要简算。
1600-435-465 438-(138+84) 562-399-101
487-187-139-61 921-(334+221) 688-534+112
×58+×41+ (-)× (+)÷+
64÷-0.6 ÷(3--) ÷[(-)÷]
【答案】700;216;62
100;366;266
12.5;;2
23.4;;4
【解析】
1600-435-465
=1600-(435+465)
=1600-900
=700
438-(138+84)
=438-138-84
=300-84
=216
562-399-101
=562-(399+101)
=562-500
=62
487-187-139-61
=487-187-(139+61)
=300-200
=100
921-(334+221)
=921-221-334
=700-334
=366
688-534+112
=688+112-534
=800-534
=266
×58+×41+
=×(58+41+1)
=×100
=12.5
(-)×
=×
=
(+)÷+
=÷+
=+
=2
(4)64÷-0.6
=24-0.6
=23.4
(5)÷(3--)
=÷[3-(+)]
=÷[3-1]
=÷2
=
(6)÷[(-)÷]
=÷[÷]
=÷
=4
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