1) 1) 5,6 - 1/5 = 56/10 - 2/10 = 54/10 = 5,4
2) 2 3/4 = 11/4 = 275/100 = 2,75
3) 2/0,6 + 1,4 = 2: 6/10 + 1.4 = 2 * 10/6 + 1,4 = 10/3 + 14/10 = (100 + 42)/30 = 142/30 = 71/30 = 2 11/30
2 11/30 < 2,75 < 5,4
Ответ: 3) 2 11/30
2) 1) √47
2) 4√7 = √ (16*7)=√112
3)16 = √256
4)2√3+9√2 = √12 + √162 = √(12 + 162)=√174
√47<√112<√174<<span>√256
Ответ: 1) √47
3) 3х²+14x+15=0
D = b2 - 4ac = 142 - 4·3·15 = 196 - 180 = 16