Đáp án: 2/4 4/2 5/14 xx 8/15 9/17 + 4/9 - ((2/4) (4/2) = (2/4) × (2/4) = (4/16) = (1/4) ) ((5/14) × (8/15) = (4/21) ) ((9/17) + (4/9) = (81/153) + (68/153) = (149/153))

((2/4) (4/2) = (2/4) × (2/4) = (4/16) = (1/4) ) ((5/14) × (8/15) = (4/21) ) ((9/17) + (4/9) = (81/153) + (68/153) = (149/153))

((2/4) (4/2)= (2/4)x(2/4)= (22/44)= (4/16)= (1/4) ) ((5/14)x (8/15)= (5x8/14x15)= (5x4x2/7x2x5x3)= (4/7x3)= (5/21) ) ((9/17)+ (4/9)= (9x9/17x9)+ (4x17/9x17) =(81/153)+ (68/153)= (81+68/153)= (149/153) )

Kisicute

6 tháng trước

$2/4 : 4/2$ $5/14 xx 8/15$ $9/17 + 4/9$

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linh20112011

6 tháng trước

$\text{$\dfrac{2}{4}$ : $\dfrac{4}{2}$ = $\dfrac{2}{4}$ × $\dfrac{2}{4}$ = $\dfrac{4}{16}$ = $\dfrac{1}{4}$ }$

$\text{$\dfrac{5}{14}$ × $\dfrac{8}{15}$ = $\dfrac{4}{21}$ }$

$\text{$\dfrac{9}{17}$ + $\dfrac{4}{9}$ = $\dfrac{81}{153}$ + $\dfrac{68}{153}$ = $\dfrac{149}{153}$}$

Nguyễn Ngọc Quang

6 tháng trước

$\text{$\frac{2}{4}$: $\frac{4}{2}$= $\frac{2}{4}$x$\frac{2}{4}$= $\frac{2.2}{4.4}$= $\frac{4}{16}$= $\frac{1}{4}$ }$

$\text{$\frac{5}{14}$x $\frac{8}{15}$= $\frac{5x8}{14x15}$= $\frac{5x4x2}{7x2x5x3}$= $\frac{4}{7x3}$= $\frac{5}{21}$ }$

$\text{$\frac{9}{17}$+ $\frac{4}{9}$= $\frac{9x9}{17x9}$+ $\frac{4x17}{9x17}$ =$\frac{81}{153}$+ $\frac{68}{153}$= $\frac{81+68}{153}$= $\frac{149}{153}$ }$