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
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. |
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