1)2 16/27 ÷ 3 1/9 = 70/27 ÷ 28/9 = 70/27 × 9/28 = 5/6
2)5/17 × 79 1/3 = 5/17 × 238/3 = 70/3 = 23 1/3
3)23 1/3 ÷ 5 = 70/3 ÷ 5 = 70/3 × 1/5 = 14/3 = 4 2/3
4)6 8/15 - 3 7/10 = 98/15 - 37/10 =(98 × 2 - 37 × 3)/30 = 196/30 - 111/30 = 85/30 = 17/6 = 2 5/6
5)2 5/6 - 5/6 = 17/6 - 5/6 = 12/6 = 2
6) 2 + 4 2/3= 2/1 + 14/3 = 2 × 3 + 14 × 1)/3 = 6/3 + 14/3 = 20/3 = 6 2/3
ответ 6 2/3
<span>1)7,3-(5,1-х)=1,8
7,3-5,1+х=1,8
х+2,2=1,8
х=1,8-2,2
х=-0,4
2)</span><span>7(6- 3Х)+6(3+2х)=57
</span><span>42-21х+18+12х=57
-9х=57-42-18
-9х=-3
9х=3
х=3/9
x=1/3
3)</span><span>11,3х - 5,2 = 1,3х + 7,4
</span><span>11,3х-1,3х=7,4+5,2
10х=12,6
х=12,6:10
х=1,26
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