x : 50 = 100 + 50
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a) 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 + 50 = 50 x 12
= 600
b) 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100 + 100 = 100 x 9
900
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50 + 50 + 50 x 100 - 20 = 50 x 100 + 50 + 50 - 20 = 5000 + 50 + 50 - 20 =5100 - 20 = 5080
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x + 25 x 4 = 50 x 50 x 100
x + 25 x 4 = 250000
x + 25 = 250000 : 4
x + 25 = 62500
x = 62500 - 25
x = 62475
x + 25 x 4 = 50 x 50 x 100
x + 25 x 4 = 250000
x + 25 = 250000 : 4
x + 25 = 62500
x = 62500 - 25
x = 62475
\(x+25.4=50.50.100\)
\(x+25.4=250000\)
\(x+100=250000\)
\(x=250000-100\)
\(x=249900\)
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x : 50 = 100 + 50
x : 50 = 150
x = 150 x 50
x = 7500
x : 50 = 100 + 50
<=> x : 50 = 150
x = 150 x 50
x = 7500
nha bn