Вправи: 146

146. Спростіть вираз:

1) 55+ x + x5+ x = 5+ x5+ x = 1;

2) 105- x – 2x5- x = 10-2x5- x = 2(5- x)5- x = 2;

3) 116+ c + 1+2c6+ c = 11+1+2c6+ c = 12+2c6+ c = 2(6+ c)6+ c = 2;

4) -2xx-2 + x+2x-2 = -2x+ x+2x-2 = -x+2x-2 = -(x-2)x-2 = –1;

5) 3yy+1 + 1-2yy+1 = 3y+1-2yy+1 = y+1y+1 = 1;

6) 4cc-1 + 1-5cc-1 = 4c+1-5cc-1 = 1- cc-1 = -(c-1)c-1 = +1.