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2/5 + (-2/15) - (-5/7) . (-7/3) =
2/5 + (-2/15) - 35/21 =
-7/5
√4/25 =
√4/√25 =
2/5
-5/7 . (-7/3.) =
-5 . -7 = 35
7 . 3 = 21
35/21
2/5 + (-2/15) - 35/21 =
Denominador común: 315.
315 : 5 = 63 . 2 = 126
315 : 15 = 21 . -2 = -42
315 : 21 = 15 . 35 = 525
126 + (-42) - 525 84 - 525 -441
-------------------------- = --------------- = --------------
315 315 315
Simplificamos:
-441 : 3 = -147
315 : 3 = 105
-147 : 3 = -49
105 : 3 = 35
-49 : 7 = -7
35 : 7 = 5
-7/5