7 2/15 -(4 -3/715)+2 12/15

Question

7 2/15 -(4 -3/715)+2 12/15

Comments

в скобке ( 4 - 3 / 715) или всё-таки (4 - 3/15) ???

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(4-3 7/15)

Answer 1

7 2/15 - ( 4 - 3 7/15) + 2 12/15 = 9,4
1) 4 - 3 7/15 = 3 15/15 - 3 7/15 = 8/15
2) 7 2/15 - 8/15 = 107/15 - 8/15 = 99/15
3) 99/15 + 2 12/15 = 99/15 + 42/15 = 141/15 = 9 6/15 = 9,4