![a+b=8\\a=0,\,\,b=8;\,\,\,000+888=0+888=888\\a=1,\,\,b=7;\,\,\,111+777=888\\a=2,\,\,b=6;\,\,\,222+666=888\\a=3,\,\,b=5;\,\,\,333+555=888\\a=4,\,\,b=4;\,\,\,444+444=888\\a=5,\,\,b=3;\,\,\,555+333=888\\a=6,\,\,b=2;\,\,\,666+222=888\\a=7,\,\,b=1;\,\,\,777+111=888\\a=8,\,\,b=0;\,\,\,888+000=888+0=888](https://tex.z-dn.net/?f=a%2Bb%3D8%5C%5Ca%3D0%2C%5C%2C%5C%2Cb%3D8%3B%5C%2C%5C%2C%5C%2C000%2B888%3D0%2B888%3D888%5C%5Ca%3D1%2C%5C%2C%5C%2Cb%3D7%3B%5C%2C%5C%2C%5C%2C111%2B777%3D888%5C%5Ca%3D2%2C%5C%2C%5C%2Cb%3D6%3B%5C%2C%5C%2C%5C%2C222%2B666%3D888%5C%5Ca%3D3%2C%5C%2C%5C%2Cb%3D5%3B%5C%2C%5C%2C%5C%2C333%2B555%3D888%5C%5Ca%3D4%2C%5C%2C%5C%2Cb%3D4%3B%5C%2C%5C%2C%5C%2C444%2B444%3D888%5C%5Ca%3D5%2C%5C%2C%5C%2Cb%3D3%3B%5C%2C%5C%2C%5C%2C555%2B333%3D888%5C%5Ca%3D6%2C%5C%2C%5C%2Cb%3D2%3B%5C%2C%5C%2C%5C%2C666%2B222%3D888%5C%5Ca%3D7%2C%5C%2C%5C%2Cb%3D1%3B%5C%2C%5C%2C%5C%2C777%2B111%3D888%5C%5Ca%3D8%2C%5C%2C%5C%2Cb%3D0%3B%5C%2C%5C%2C%5C%2C888%2B000%3D888%2B0%3D888)
Как видим, во всех вариантах выходит 888.
Ответ б) 888.
5(4х+y)- 2(x-y)= 20x+5y-2x+2y= 20x-2x+5y+2y=18x+7y
(подобные слагаемые - числа с одной и тойже буквой. В даном случаи для "х" подобные слагаемые - 20 и 2, а для "у" 5 и 2) давай удачи
1) 6 2)0,15 3)0,875 4)0,285714 вроде так
1) 13×14+37×14=112+328=440
2) 72×54-43×54= 358-212=146
3) 38×26+17×26-54+26=648+242-54+26=890-54+26=836+26=862
4)86×47-35×47-47+296= 522-155-47+296=477-47+296=430+296=724