Решите каждое уравнение двумя способами.
1) (а+46)+77=148
а+46=_-_
а+46=_
а=_
2 способ: (а+46)+77=184
а+_+_=184
а+_=184
а=_
2) (45+х)-16=51
45+х=51_16
45+х=_
Х=_
2 способ:(45+х)-16=51
(45-_)+х=51
_+х=51
х=_

3) 86+(42-у)=104
42-у=104_86
42-у=_
У=_
2 способ: 86+(42-у)=104
(86+_)-у=104
_-у=_
У=_
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