x+21 \% x=100
Datrys ar gyfer x
x = \frac{10000}{121} = 82\frac{78}{121} \approx 82.644628099
Graff
Rhannu
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\frac{121}{100}x=100
Cyfuno x a \frac{21}{100}x i gael \frac{121}{100}x.
x=100\times \frac{100}{121}
Lluoswch y ddwy ochr â \frac{100}{121}, cilyddol \frac{121}{100}.
x=\frac{100\times 100}{121}
Mynegwch 100\times \frac{100}{121} fel ffracsiwn unigol.
x=\frac{10000}{121}
Lluosi 100 a 100 i gael 10000.
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