700-670=30
560-550=10
890-789=101
<span>11 1/3:4/21:4 1/4 = 34/3*21/4*4/17 (сокращаем 34 и 17 на 17, 21 и 3 на 3, 4 и 4 на 4) =14
11 1/3= 34/3
4 1/4=4/17
</span>
9*3=27
34-27=7
ответ: на 7
1) х+7,9=15,7*(48-0,02)
х+7,9=753,6-0,314
х+7,9=753,286
х=745,386
2) х-56,3=2144,1-7662,0945
х-56,3=-5517,9945
х=-5461,6945
(34-х)=1376÷86
(34-х)=16
х=34-16
х=18
205×29=(х-57)
5945=(х-57)
х=57+5945
х=6002