Решите 2518:0,02 3016,2*12,4 4х+28=36 100-4*(х+2)=72 2 1/4+10 3/7 10 1/5-3 1/4 2 1/2*3...

2518 : 0,02 = 125.9003016,2 * 12,4 = 37400,88

4х + 28 = 36
4х = 8
х = 2

100 – 4 * (х+2) = 72
х = 5

2 1/4 + 10 3/7 = $\frac{63}{28}$ + $\frac{292}{28}$ =
= $\frac{355}{28}$ = 12 $\frac{19}{28}$

10 1/5 - 3 1/4 = $\frac{51}{5}$ – $\frac{13}{4}$ =
= $\frac{204}{20}$ – $\frac{65}{20}$ =
= $\frac{139}{20}$ = 6 $\frac{19}{20}$

2 1/2 * 3 2/5 = $\frac{5}{2}$ * $\frac{17}{5}$ =
= $\frac{25}{10}$ * $\frac{34}{10}$ = $\frac{850}{10}$ = 85

4 1/5 : 2 = 4,2 ÷ 2 = 2,1