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用递等式计算并用计算器验算.(1)53-62+79.89-15.56(2)78.37+(132.25-29.18)(3)262.39-87.25-18.36(4)198.2-(250.62-180.35)

题目详情
用递等式计算并用计算器验算.
(1)53-62+79.89-15.56
(2)78.37+(132.25-29.18)
(3)262.39-87.25-18.36
(4)198.2-(250.62-180.35)
▼优质解答
答案和解析
(1)53-62+79.89-15.56,
=-9+79.89-15.56,
=70.89-15.56,
=55.33;

(2)78.37+(132.25-29.18),
=78.37+103.07,
=181.44;

(3)262.39-87.25-18.36,
=175.14-18.36,
=156.78;

(4)198.2-(250.62-180.35),
=198.2-70.27,
=127.93.