1) 2а-1/4+а-1/3=3а-7/12
3а-7/12>0 если а>7/36
2) 3b-1/2+5b/4+1=17b/4+1/2<0
17b<-2
b<-2/17
2кг 400г= 2400г
2400×2/6=800 г
<em>(х+15)-8=17
х+15=17+8
х+15=25
х=25-15
х=10
(10+15)-8=17
25-8=15
15=15</em>
1)637 637:7=91 091
2)91 091:11=8 281
3)8 281:13=637
4)637*1001=1 638
ответ1 638
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Сумма первых 16 членов арифметической прогрессии =24