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Tohaina

\sqrt{60\times 35\left(60-56\right)\left(60-39\right)}
Tangohia te 25 i te 60, ka 35.
\sqrt{2100\left(60-56\right)\left(60-39\right)}
Whakareatia te 60 ki te 35, ka 2100.
\sqrt{2100\times 4\left(60-39\right)}
Tangohia te 56 i te 60, ka 4.
\sqrt{8400\left(60-39\right)}
Whakareatia te 2100 ki te 4, ka 8400.
\sqrt{8400\times 21}
Tangohia te 39 i te 60, ka 21.
\sqrt{176400}
Whakareatia te 8400 ki te 21, ka 176400.
420
Tātaitia te pūtakerua o 176400 kia tae ki 420.