问题 解答题

递等式计算(能简算的要简算).

(1)92.3-55.51+4.49

(2)6.52+1.43+8.57+3.48

(3)75.8-13.57-1.43

(4)39×89+39×12-39

(5)5208÷(31×56)

(6)(2657+35×26)÷29.

答案

(1)92.3-55.51+4.49

=36.79-4.49,

=32.3;

(2)6.52+1.43+8.57+3.48

=(6.52+3.48)+(1.43+8.57),

=10+10,

=20;

(3)75.8-13.57-1.43

=75.8-(13.57+1.43),

=75.8-15,

=60.8;

(4)39×89+39×12-39

=(89+12-1)×39,

=100×39,

=3900;

(5)5208÷(31×56)

=5208÷1736,

=3;

(6)(2657+35×26)÷29

=(2657+910)÷29,

=3567÷29,

=123.

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