Найдите значение выражения1)8 7/10-( 7 4/5- а) приа=6 1/2 2)14 1/6(8 9/10-b) при b=5 2/3
3)а-(9 3/50-5 7/25)при а=7 1/2
4)(20 1/5-b)-6 1/3 при b=11 2/15
Помогите​
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