найдите значение выражения.
1) (-5/8)*(-4/5)*(-3/4)*(-2/3)*(-1/2)=
2) (-7/12)*(-6/7)*(-5/6)*(4/5)+2/3=
3) (-11/15)*(-10/11)*(-9/10)+(-7/9)*(-6/7)+4/15=
помогите пожалуйста =)​
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