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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

解:原式=(5/7×21/5)×16 =3×16 =48

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

5/16×20/21×1/5的简便计算 =5/16x1/5x20/21 =1/16x20/21 =5/84

5/7x16x21/5 =5/7x21/5x16 =3x16 =48

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

5/7×16÷5/21 =5/7×21/5×16 =3×16 =48

5/7+19/25×4+21/25×19 =5/7+(19/25)X(4+21) =5/7+19 =19又7分之5

7/10×5/16×8/21 =7/21×5/10×8/16 =1/3×1/2×1/2 =1/12

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