Помогите пожалуйста решить
1) (1,545 : 1,5 -1) *2 2/3 +0,5 *4/15
2) ( 2,678 : 1,3 - 2) * 3 1/3 + 0,3 * 7/15
3) 2/7 : 8 + 5 : 0,7 - 3/4 : 21
4) 3 : 4 1/5 + 5,4 : 7,2 - 2/7 : 0,8
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