35/121乘以5/37加5/121乘2/37怎样简便计算?

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35/121乘以5/37加5/121乘2/37怎样简便计算?

35/121×5/37+5/121×2/37
=35/121×5/37+2/121×5/37
=(35/121+2/121)×5/37
=37/121×5/37
=5/121