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y x 5 + y x 9 + y x 6 = 1200
y x ( 5+ 9 + 6 ) = 1200
y x 20 = 1200
y = 1200 : 20
y = 60
y x 5 + y x 9 + y x 6 = 1200
y x ( 5 + 9 + 6 ) = 1200
y x 20 = 1200
y = 1200 / 20
y = 60
y x 4 + y x 6 = 200 : 10
y x ( 4 + 6 ) = 20
y x 10 = 20
y = 20 : 10
y = 2
Bài 1:
+) \(\dfrac{7}{8}\times y=\dfrac{3}{2}+\dfrac{6}{4}=3\)
\(y=3:\dfrac{7}{8}=\dfrac{24}{7}\)
+) \(\dfrac{1}{y}\times\left(\dfrac{2}{5}+\dfrac{1}{5}\right)=\dfrac{10}{3}\)
\(\dfrac{1}{y}=\dfrac{10}{3}:\dfrac{3}{5}=\dfrac{50}{9}\)
\(y=\dfrac{9}{50}\)
y x 6 + y x 8 + y x 4 = 2000
y x ( 6 + 8 + 4 ) = 2000
y x 18 = 2000
y = 2000 : 18
y = 111 ( dư 2 )
y x 6 + y x 8 + y x 4 = 2000
=> y x ( 6 + 8 + 4) = 2000
=> y x 18 = 2000
=> y= 111
vậy y = 111
y x 4 + y x 6 = 200
y x ( 4 + 6 ) = 200
y x 10 = 200
y = 200 : 10
y = 10
a. x = 1+ 2+ 3+ 4 + 5 + 6 + 7 + 8 + 9 +10
= (1 +10) + (2+9) + ( 3 +8 ) + (4 + 7 ) + (5 + 6)
= 11 +11 + 11+ 11 +11
= 11 x 5
= 55
b. y = 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20
= (2+20) + (4 + 18) + (6 + 16) +(8 + 14) + (10 +12)
= 22 + 22 + 22 +22 + 22
= 22 x 5
= 110
y+(265.5)=150265352
y+1325=150265352
y=150265352-1325
y=150264027
y.4.2+4=804
y.8+4=804
y.8=804-4
y.8=800
y=100
y-25.2:6=100
y-25.2=100.6
y-25.2=600
y-50=600
y=600+50
y=650
y x 10 + y x 6 + y x 4 = 1200
y x ( 10 + 6 + 4 ) = 1200
y x 20 = 1200
y = 1200 : 20
y = 60
Vậy x = 60
y x 10 + y x 6 + y x 4 = 1200
y x ( 10 + 6 + 4 ) = 1200
y x 20 = 1200
y = 1200 / 20
y = 60