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5/7×16×21/5简便运算.

5/7×16×21/5 = (5/5)×16×(21/7) = 1×16×3 = 48

7与21相约得3,分子中的5与分母的5相约,所以最后答案为3x16=48

=5/7x16x21/5 =16x3=48

5/7*16*21/5 =5/7*21/5*16 =3*16 =48

48

解:依题意得算式, 7分之5×16×5分之21 =7分之5×5分之21×16 =3×16 =48 即7分之5×16×5分之21=48

5/7×5/16×21/5 =(5/7×21/5)×5/16 =3×5/16 =15/16

16×21.5 = 344 竖式

要简便运算 5/21×2/7+2又19/21×5/7+(1-2/7) =2/21×5/7+2又19/21×5/7+5/7 =(2/21+2又19/21+1)×5/7 =4×5/7 =20/7

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