-1/4 + 3/5 ; 9/11 + (-2/5) ; -20/21 + 3/7 ; 7 5/12 + (-3 7/24) ; -6 11/12 + (-8 13/18) ; -5 12/35 + 10 ; -3 1/12 + 1/6. Помогите пожалуйста просто я двоишник и не знаю как дклать​
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