计算下面各题,怎样简便就怎样算.135-l7-18 1489-382-18 376-(124+76) 1800÷45÷2 &nbs...
计算下面各题,怎样简便就怎样算.135-l7-181489-382-18376-(124+76)1800÷45÷24700÷25÷4(450-72)÷9....
计算下面各题,怎样简便就怎样算.135-l7-18 1489-382-18 376-(124+76) 1800÷45÷2 4700÷25÷4 (450-72)÷9.
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(1)135-l7-18,
=135-(17+18),
=135-35,
=100;
(2)1489-382-18,
=1489-(382+18),
=1489-400,
=1089;
(3)376-(124+76),
=376-76-124,
=300-124,
=176;
(4)1800÷45÷2,
=1800÷(45×2),
=1800÷90,
=20;
(5)4700÷25÷4,
=4700÷(25×4),
=4700÷100,
=47;
(6)(450-72)÷9,
=450÷9-72÷9,
=50-8,
=42.
=135-(17+18),
=135-35,
=100;
(2)1489-382-18,
=1489-(382+18),
=1489-400,
=1089;
(3)376-(124+76),
=376-76-124,
=300-124,
=176;
(4)1800÷45÷2,
=1800÷(45×2),
=1800÷90,
=20;
(5)4700÷25÷4,
=4700÷(25×4),
=4700÷100,
=47;
(6)(450-72)÷9,
=450÷9-72÷9,
=50-8,
=42.
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