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Tohaina

\frac{4b\times 5b}{\left(2b+1\right)\left(a+1\right)}
Whakawehe \frac{4b}{2b+1} ki te \frac{a+1}{5b} mā te whakarea \frac{4b}{2b+1} ki te tau huripoki o \frac{a+1}{5b}.
\frac{4b^{2}\times 5}{\left(2b+1\right)\left(a+1\right)}
Whakareatia te b ki te b, ka b^{2}.
\frac{20b^{2}}{\left(2b+1\right)\left(a+1\right)}
Whakareatia te 4 ki te 5, ka 20.
\frac{20b^{2}}{2ba+2b+a+1}
Me hoatu te āhuatanga tohatoha mā te whakarea ia tau o 2b+1 ki ia tau o a+1.
\frac{4b\times 5b}{\left(2b+1\right)\left(a+1\right)}
Whakawehe \frac{4b}{2b+1} ki te \frac{a+1}{5b} mā te whakarea \frac{4b}{2b+1} ki te tau huripoki o \frac{a+1}{5b}.
\frac{4b^{2}\times 5}{\left(2b+1\right)\left(a+1\right)}
Whakareatia te b ki te b, ka b^{2}.
\frac{20b^{2}}{\left(2b+1\right)\left(a+1\right)}
Whakareatia te 4 ki te 5, ka 20.
\frac{20b^{2}}{2ba+2b+a+1}
Me hoatu te āhuatanga tohatoha mā te whakarea ia tau o 2b+1 ki ia tau o a+1.