Действия с десятичными дробями

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

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

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

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

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

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

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

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

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

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

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

$$-2\cdot (-8,6)-9,4=$$$$2(8+0,6)-9,4=$$$$16+1,2-9,4=7,8$$

$$5,4*0,8+0,08=$$$$5,4*0,8+0,1*0,8=$$$$0,8(5,4+0,1)=0,8*5,5=4,4$$

$$0,03*0,3*30000=$$$$3*10^{-2}*3*10^{-1}*3*10^{4}=$$$$27*10^{-2-1+4}=$$$$27*10=270$$

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$$\frac{9,6}{3,7-5,2}=\frac{9,6}{-1,5}=-6,4$$