问题 解答题

递等式计算(能简算的就简算).

(1)3.37+12.89+2.63

(2)513000÷125÷8

(3)39×26+26×61

(4)31.25-6.29-4.71

(5)130×(300-125÷25)

(6)2748÷[216÷(155-83)].

答案

(1)3.37+12.89+2.63,

=(3.37+2.63)+12.89,

=6+12.89,

=18.89;

(2)513000÷125÷8,

=513000÷(125×8),

=513000÷1000,

=513;

(3)39×26+26×61,

=(39+61)×26,

=100×26,

=2600;

(4)31.25-6.29-4.71,

=31.25-(6.29+4.71),

=31.25-11,

=20.25;

(5)130×(300-125÷25),

=130×(300-5),

=130×300-130×5,

=39000-650,

=38350;

(6)2748÷[216÷(155-83)],

=2748÷[216÷72],

=2748÷3,

=916.

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