用合理的方法计算. 30600÷(6+4×2+4) 5.08-(1.08+2.59) 20-(3.7-1.55+0.82?
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(1)30600÷(6+4×2+4)
=30600÷18,
=1700;
(2)5.08-(1.08+2.59)
=5.08-1.08-2.59,
=4-2.59,
=1.41;
(3)20-(3.7-1.55+0.82)
=20-(2.15+0.82),
=20-2.97,
=17.03;
(4)18.44+7.17+2.83+1.56
=(18.44+1.56)+(7.17+2.83),
=20+10,
=30;
(5)13.6-4.25-5.75
=13.6-(4.25+5.75),
=13.6-10,
=3.6;
(6)[240+(124-118)×12]÷8
=[240+6×12]÷8,
=[240+72]÷8,
=240÷8+72÷8,
=30+9,
=39.,10, 用合理的方法计算.
30600÷(6+4×2+4) 5.08-(1.08+2.59) 20-(3.7-1.55+0.82) 18.44+7.17+2.83+1.56 13.6-4.25-5.75 [240+(124-118)×12]÷8.
=30600÷18,
=1700;
(2)5.08-(1.08+2.59)
=5.08-1.08-2.59,
=4-2.59,
=1.41;
(3)20-(3.7-1.55+0.82)
=20-(2.15+0.82),
=20-2.97,
=17.03;
(4)18.44+7.17+2.83+1.56
=(18.44+1.56)+(7.17+2.83),
=20+10,
=30;
(5)13.6-4.25-5.75
=13.6-(4.25+5.75),
=13.6-10,
=3.6;
(6)[240+(124-118)×12]÷8
=[240+6×12]÷8,
=[240+72]÷8,
=240÷8+72÷8,
=30+9,
=39.,10, 用合理的方法计算.
30600÷(6+4×2+4) 5.08-(1.08+2.59) 20-(3.7-1.55+0.82) 18.44+7.17+2.83+1.56 13.6-4.25-5.75 [240+(124-118)×12]÷8.
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