2,18,19 !!!!! Помогите!!!

Question

2,18,19 !!!!! Помогите!!!

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Answer 1

1) 10\3+25\10 = 175\30 = 35\6
2) 10\3 - 25\10 = 25\30 = 5\6
3) 35\6 : 5/6 = 35\6 * 6\5 = 7
40% = 0,4
7*0,4 = 2,8