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4分の3は2.84で割って3又5分の3÷(1又2分の1は1.42に乗ります)で1又5分の4を乗ります。 =(4分の3÷1又1/2)乗法(2.84÷1.42)×(1又4/5は3又5分の3) =0.5×2×0.5 =0.5
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