Раскройте скобки и найдите значения выражения -2,78-(7,2+3,22)

Упростите выражения -(1,6+b)+b
(-m-n)-(m-n)

Решите уравнения
6,8-(1,3-x)=1,1
-5/11-(x+1/22)=1,5
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