(154и135),(154и315),,(315и154),(135и154
×-2/7-×/2=9 | *7-× не равн. 0
(×-2)/2 (7-×)=9 (7-×) | *2 (7-×), × не равн.0
×-2=18
×=20
ответ.×=20
A) 2/3*42/28=84/84=1
b) 11/12 : 27/7=264/84 * 21/22=6(целых) 544/848
4-3
4-2
4-1
4
4+1
4+2
4+3
4+4
4+5
4+6
(32 - m) · 6 - 39 = 45
(32 - m) · 6 = 45 + 39
(32 - m) · 6 = 84
32 - m = 84 : 6
32 - m = 14
m = 32 - 14
m = 18
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Проверка: (32 - 18) · 6 - 39 = 45
14 · 6 - 39 = 45
84 - 39 = 45
45 = 45