Tìm y biết:
2020 - y : 8 x 10 = 1000
y : 8 x 10 = 2000 - 1000
y : 8 x 10 = 1000
y : 8 = 1000 : 10
y : 8 = 100
y = 100 x 8
y = 800
Vậy y = 800
\(2020-y:8\times10=1000\)
\(2020-y:80=1000\)
\(y:80=2020-1000\)
\(y:80=1020\)
\(y=1020\times80\)
\(y=81600\)
2020-y:8=1000:10
2020-y:8=100
2020-y=100x8
2020-y=800
y=2020-800=1220
\(2020-y:8\times10=1000\)
\(y:8\times10=2020-1000\)
\(y:8\times10=1020\)
\(y:8=1020:10\)
\(y:8=102\)
\(y=102\times8\)
\(y=816\)
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