Решите уравнения:
1. 6-х/3 =х/7
2. x+5/6 -х/5=1
3. х+х/9 = 2
4. 4х+4/8 +5 = 9х/7
1. 6-х/3 =х/7
2. x+5/6 -х/5=1
3. х+х/9 = 2
4. 4х+4/8 +5 = 9х/7
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Answers & Comments
10x=6·21
x=6·21/10=6·2.1=12.6
2) (x+5)/6-x/5=1 ⇒(5(x+5)-6x)/30=1 ⇒5x+25-6x=30
-x=30-25=5
x=-5
3) x+x/9=2 ⇒(9x+x)9=2 ⇒10x=18;x=1.8
4)(4x+4)/8+5=9x/7 ⇒7·(4x+4)-9·8·x=(-5)·8·7
28x+28-72x=-280
44x=308
x=7