5/12=(5/12)·3=15/36=(15/36)·7=105/252
7/18=(7/18)·2=14/36=(14/36)·7=98/252
1/2=(1/2)·18=18/36=(18/36)·7=126/252
4/9=(4/9)·4=16/36=(16/36)·7=112/252
14/21=2/3=(2/3)·12=24/36=(24/36)·7=168/252
17/28=(17/28)·9=153/252
98/252<105/252<112/252<126/252<153/252<168/252
7/18<5/12<4/9<1/2<17/28<14/21
1)48 = 2 * 2 * 2 * 2 *3
84 = 2 * 2 * 3 * 7
НОД (48; 84) = 2 * 2 * 3 = 12
2)70 = 2 * 5 * 7
98 = 2 * 7 * 7
НОД (70; 98) = 2 * 7 = 14
3)35 = 5 * 7
60 = 2 * 2 * 3 * 5
НОД (35; 60) = 5
4)52 = 2 * 2 * 13
78 = 2 * 3 * 13
НОД (52; 78) = 2 * 13 = 26
5)44 = 2 * 2 *· 11
65 = 5 * 13
НОД (44; 65) = 1
6)72 = 2 * 2 * 2 * 3 * 3
96 = 2 * 2 * 2 * 2 * 2 * 3
НОД (72; 96) = 2 * 2 * 2 * 3 = 24
7)78 = 2 * 3 * 13
117 = 3 * 3 * 13
195 = 3 * 5 * 13
НОД (78; 117; 195) = 3 * 13 = 39
8)110 = 2 · 5 · 11
154 = 2 * 7 * 11
286 = 2 * 11 * 13
НОД (110; 154; 286) = 2 * 11 = 22
9)90 = 2 * 3 * 3 * 5
126 = 2 * 3 * 3 * 7
162 = 2 * 3 * 3 * 3 * 3
НОД (90; 126; 162) = 2 * 3 * 3 = 18
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А) 42, 93, 213, 180, 315
б) 180, 315.
-1+56-48x=2x+6
-48x-2x=6-55
-50x=-49
x=49/50