ОГЭ / Числа и вычисления

$$4,4-1,7=(3+1,4)-(1+0,7)=$$$$3-1+1,4-0,7=2+0,7=2,7$$

$$7,9+2,2=7+0,9+2+0,2=$$$$9+1,1=10,1$$

$$5,2*3,1=$$$$\frac{52}{10}*\frac{31}{10}=$$$$\frac{1612}{100}=16,12$$

$$\frac{9,6}{1,6}=$$$$\frac{96:4}{16:4}=$$$$\frac{24}{4}=6$$

$$\frac{2,4}{2,9-1,4}=$$$$\frac{2,4}{1,5}=$$$$\frac{24}{15}=1,6$$

$$\frac{6,9-1,5}{2,4}=$$$$\frac{5,4}{2,4}=$$$$\frac{54}{24}=2,25$$

$$\frac{6,9+4,1}{0,2}=$$$$\frac{11}{0,2}=$$$$\frac{11*10}{2}=55$$.

$$\frac{21}{0,6*2,8}=$$$$\frac{21*100}{6*28}=$$$$\frac{7*25}{2*7}=12,5$$

$$\frac{8,8*0,8}{4,4}=$$$$\frac{\frac{88}{10}*\frac{8}{10}}{\frac{44}{10}}=$$$$\frac{88*8*10}{10*10*44}=$$$$\frac{2*8}{10}=1,6$$

$$30-0,8*(-10)^2=$$$$30-0,8*100=$$$$30-80=-50$$

$$5,4*0,8+0,08=$$$$54*0,08+0,08=$$$$55*0,08=4,4$$

$$\frac{4}{25}+\frac{15}{4}=$$$$\frac{4*4+15*25}{4*25}=$$$$\frac{391}{100}=3,91$$

$$\frac{3}{2}-\frac{9}{5}=$$$$\frac{3*5-9*2}{2*5}=$$$$\frac{15-18}{10}=-0,3$$

$$\frac{3}{4}*\frac{6}{5}=$$$$\frac{3*6}{4*5}=$$$$\frac{3*3}{2*5}=0,9$$

$$\frac{3}{5}:\frac{2}{15}=$$$$\frac{3}{5}*\frac{15}{2}=$$$$\frac{3*15}{5*2}=4,5$$