(3 1/8+1 3/4)х=3/4
(25/8+7/4)х=3/4
(25/8+14/8)х=3/4
39/8*х=3/4 ///*8
39х=6
Х=6/39=2/13
25z=149-4925z=100z=100:25=4
<span> 13+10t=163
</span>10t=163-13
10t=150
t=150:10=15
<span>9y-54=162
</span>9у=162+54
9у=216
у=216:9=24
<span>181-8r=45
</span>8r=181-45
8r=136
r=136:8=17
20м9дм=209дм=2090см=209000мм
1)30668:374=82
2)1470:15=98
|-0,63|:|x|=|-0,9|
<span>0,63/х=0,9</span>
<span>х=0,63/0,9</span>
<span>х=0,7</span>
<span>х1=0,7, х2=-0,7</span>
<span>|0,7|=0,7</span>
<span>|-0,7|=0,7</span>