4 1/6 + 5/8=4 4/24+15/24=4 39/24=5 15/24=5 5/8
4 1/12-1 2/5=4 5/60-1 24/60= 3 65/60-1 24/60=2 41/60
4 5/12-(13-10 5/9)=4 5/12-(12 9/9-10 5/9)=
4 5/12-2 4/9= 4 15/36-2 16/36=3 41/36-2 16/36=
=1 25/16=2 9/16
<span>1+8(-x+10)-9
= 0
1-8x+80-9 = 0
-8x + 72 = 0
-8x = - 72 ║ : -8
x = 9
Ответ: 9
</span>
3210
+
3210
____
6420
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