问题 计算题
脱式计算。
(1)692-(189+257)(2)356+173-238(3)(72-48)÷8
(4)754+167-354(5)3800-143-857(6)439-(154+139)
答案

(1)692-(189+257)

 =692-446

 =246(2)356+173-238

 =529-238

 =291(3)(72-48)÷8

 =24÷8

 =3

(4)754+167-354

 =400+167

 =567(5)3800-143-857

 =3800-1000

 =2800(6)439-(154+139)

 =300-154

 =146

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