Question

(3/20 + 1/2 - 1/15) × 12/49

Mình ngu Toán nên....

Giúp mình nhá😂

Answer 1

\(\left(\dfrac{3}{20}+\dfrac{1}{2}-\dfrac{1}{15}\right)\times\dfrac{12}{49}\)

\(=\left(\dfrac{3}{20}+\dfrac{10}{20}-\dfrac{1}{15}\right)\times\dfrac{12}{49}\)

\(=\left(\dfrac{13}{20}-\dfrac{1}{15}\right)\times\dfrac{12}{49}\)

\(=\left(\dfrac{39}{60}-\dfrac{4}{60}\right)\times\dfrac{12}{49}\)

\(=\dfrac{35}{60}\times\dfrac{12}{49}\)

\(=\dfrac{35\times12}{60\times49}\)

\(=\dfrac{1}{7}\)

_HT_

Answer 2

= (13/20-1/15)x12/49

=48/60x12/49

=576/2940

Answer 3

(320+12−115)×1249(320+12−115)×1249

=(320+1020−115)×1249=(320+1020−115)×1249

=(1320−115)×1249=(1320−115)×1249

=(3960−460)×1249=(3960−460)×1249

=3560×1249=3560×1249

=35×1260×49=35×1260×49

=17=17

_HT_ 

 

 

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