490.вычислите
1)(1/4-2/3)•(4/5-2/15)•(-3/5)
2)(1/6-5/9)•(1/2-3/7)•7 1/5
3)(5/6-2/3)•(7/8-1/2)•(-4)
4)(3/8-1/6)•(2/9-2/5)•27
1)(1/4-2/3)•(4/5-2/15)•(-3/5)
2)(1/6-5/9)•(1/2-3/7)•7 1/5
3)(5/6-2/3)•(7/8-1/2)•(-4)
4)(3/8-1/6)•(2/9-2/5)•27
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Ответ:
1) 1/6
2)-1/5
3)-1/4
4)-1