Question

Tìm y biết:

a) y x 4 + y x 6 = 240

b) y x 22 + y x 78 = 4200

c) y x 6 – y x 2 = 2844

d) y x 286 – y x 186 = 21900

e) 166 : y + 34 : y =10

g) 2125 : y – 125 : y = 80

h) (y + 5) x 2020 = (200 + 5) x 2020

i) y - 45600 = (2019 - 419) x 4 x 25

Answer 1

giúp mình nhé

Answer 2

\(a,y\times4+y\times6=240\\ \Rightarrow y\times\left(4+6\right)=240\\ \Rightarrow y\times10=240\\ \Rightarrow y=240:10\\ \Rightarrow y=24\)

\(b,y\times22+y\times78=4200\\ \Rightarrow y\times\left(22+78\right)=4200\\ \Rightarrow y\times100=4200\\ \Rightarrow y=4200:100\\ \Rightarrow y=42\)

\(c,y\times6-y\times2=2844\\ \Rightarrow y\times\left(6-2\right)=2844\\ \Rightarrow y\times4=2844\\ \Rightarrow y=711\)

\(d,y\times286-y\times186=21900\\ \Rightarrow y\times\left(286-186\right)=21900\\ \Rightarrow y\times100=21900\\ \Rightarrow y=21900:100\\ \Rightarrow y=219\)