Помогите пжт с 3 пунктом

Question

Помогите пжт с 3 пунктом

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Answer 1

(15 1/3-8 5/18)*2 4/7:6 1/21-2 5/8 = 3/8

1) 15 1/3-8 5/18= 15 6/18 - 8 5/18= 7 1/18
2) 7 1/18 * 2 4/7= 127/18 * 18/7=127*18/18*7= 127/7= 18 1/7
3) 18 1/7 : 6 1/21= 127/7 : 127/21= 127/7 * 21/127= 21/7=3
4) 3 - 2 5/8= 3/8