1) -6 3/4*5 1/3-4 1/3*3 3/13
2) (-2 1/6+1/4)*(-2 2/11)
3) 3 6/7*(-2 1/3)-8/9*(-1 7/8)
4) (-8 3/8+7 1/6)*(-2 14/29)

Помогите пожалуйста​
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