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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