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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

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

解:原式=(5/7×21/5)×16 =3×16 =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

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

原式可化为5/7*21/5*16(5/7就是7分之5,21/5同理)5/7分子5与21/5的分母5约掉,5/7的分母7与21/5的分母相约,结果5/7被约掉,21/5化为3,然后该式化为:3*16=48

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