Question

решить уравнения 
( х+2 313)- 1 726= 4 5 39

8 718- (1 1115+у)= 3 415+2 1345
найди значение выражения наиболее удобным способом 
2 9/49 + (7 3/85 + 3 40/49)

(5 16/39 + 1 6/11) - 2 16/39

7 13/14 - ( 2 13/14 + 4 17/25)

Answer 1

$1.;;(x+2frac3{13})- 1frac7{26}= 4frac5{39}\x+frac{29}{13}-frac{33}{26}=frac{151}{39}\ x+frac{58-33}{26}=frac{151}{39}\x=frac{151}{39}-frac{25}{26}\x=frac{322-75}{78}\x=frac{247}{78}=farc{19}6=3frac16\ 2.;;8frac7{18}- left(1frac{11}{15}+yright)= 3frac4{15}+2frac{13}{45}\ frac{151}{18}- frac{26}{15}+yright)=frac{49}{15}+frac{103}{45}\frac{755-156}{90}+y=frac{147+103}{45}\y=frac{250}{45}-frac{599}{90}\y=frac{500-599}{90}\y=-frac{99}{90}=-1frac9{90}=-1frac1{10}$
$3.;;2frac9{49} + left(7frac3{85} + 3frac{40}{49}right)=frac{107}{49} + frac{598}{85} + frac{187}{49}=frac{294}{49}+frac{598}{85}=6+frac{598}{85}=\=frac{510+598}{85}=frac{1108}{85}=13frac3{85}\ 4.;;left(5frac{16}{39} + 1frac6{11}right) - 2frac{16}{39}=frac{211}{39}+frac{17}{11}-frac{94}{29}=frac{117}{39}+frac{17}{11}=3+frac{17}{11}=frac{50}{11}=4frac6{11}$
$5.;;7frac{13}{14} - left( 2frac{13}{14} + 4frac{17}{25}right)=frac{111}{14}-frac{41}{14}+frac{117}{25}=frac{70}{14}+frac{117}{25}=5+frac{117}{25}=\ frac{125+117}{25}=frac{242}{25}=9frac{17}{25}$