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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)].

题目详情
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)].
▼优质解答
答案和解析
(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.