\(\text{#}HaimeeOkk\)

\(17 , 76 + x : 2 , 36 = 42 , 3\)

\(x : 2 , 36 = 24 , 54\)

\(x = 57 , 9144\)

\(18+x:2.36=42.3\)

\(x:2.36=42.3-18\)

\(x:2.36=24.3\)

\(x=24.3\times2.36\)

\(x=57.348\)

x=57,348

2,36+2,36*2

=2,36+4,72

=7,08

Đáp số: 7,08

2,36+2,36*2=2,36*(2+1)

                      =2,36*3

                     =7,08

2,36 + 2,36 x 2

= 2,36 + 4,72

= 7,08

\(x=\dfrac{3}{8}-\dfrac{5}{6}=-\dfrac{11}{24}\)

\(x=\left(\dfrac{5}{6}+\dfrac{1}{2}\right):\dfrac{2}{3}=2\)

\(x=\dfrac{7,5.2,4-42,3}{2,36}=-\dfrac{1215}{118}\)

\(x\times0,49+x\times0,01=1,2\\ =>x\times\left(0,49+0,01\right)=1,2\\ =>x\times0,5=1,2\\ =>x=1,2:0,5\\ =>x=2,4\)

X x 0,49 + X x 0,01 = 1,2 

X x (0,49 + 0,01) = 1,2 

X x 0,5 = 1,2 

X = 1,2 : 0,5 

X = 2,4 

h

245,9 x 0,49 - 245,9 x 0,58 + 24,58
= (245,9 x 0,49) - (245,9 x 0,58) + 24,58
= 120,491 - 142,622 + 24,58
= (120,492 + 24,58) - 142,622
= 145,071 - 142,622
= 2,449

=24,59(4,9+1-5,8)=24,59x0,1=2,459

\(=245,9\times\left(0,49+\dfrac{1}{10}-0,58\right)=245,9\times\dfrac{1}{100}=2,459\)

\(1,35-x+0,49=0,48\)

\(0,86-x=0,48\)

\(x=0,38\)

\(1,35-x+0,49=0,48\)

\(x-0,49=1,35-0,48\)

\(x-0,49=0,87\)

\(x=0,87+0,49\)

\(x=1,36\)

Vậy x = 1,36

245,9 x 0,58 - 245,9 x 0,49 + 2,459

= 245,9 x 0,58 - 245,9 x 0,49 + 245,9 : 100

= 245,9 x 0,58 - 245,9 x 0,49 + 245,9 x 0,01

= 245,9 x (0,58 - 0,49 + 0,01)

= 245,9 x 0,1

= 245,9 : 10

= 24,59

245,9 x 0,58 - 245,9 x 0,49 + 2,459 

= 245,9 \(\times\) 0,58 - 245 ,9 \(\times\) 0,49 +  ( 2,459 \(\times\) 100 ) \(\div\) 0,01

= 245,9 \(\times\) 0,58 - 245 ,9 \(\times\) 0,49 + 245,9 \(\div\) 0,01

= 245,9 \(\times\) ( 0,58 - 0,49 + 0,01 )

= 245,9 \(\times\) 0,1

= 24,59

A, D là đúng. còn đâu sai