a)8.(-1/2) mũ 4 b)5,3×4,7+(-1,7)x5,3-5,9 c)2/3+-1/3+7/15 d)40:{[11+(26-3 mũ 3)]x2}

2 bình luận về “a)8.(-1/2) mũ 4 b)5,3×4,7+(-1,7)x5,3-5,9 c)2/3+-1/3+7/15 d)40:{[11+(26-3 mũ 3)]x2}”

1. Giải đáp:

    a)

   8.(-\frac{1}{2})^{4}

   =8.\frac{(-1)^{4}}{2^{4}}

   =\frac{8.1}{16}

   =\frac{8}{16}

   =\frac{1}{2}

   b)

   5,3xx4,7+(-1,7)xx5,3-5,9

   =5,3.(4,7-1,7)-5,9

   =5,3.3-5,9

   =15,9-5,9

   =10

   c)

   \frac{2}{3}+\frac{-1}{3}+\frac{7}{15}

   =(\frac{2}{3}-\frac{1}{3})+\frac{7}{15}

   =\frac{1}{3}+\frac{7}{15}

   =\frac{5}{15}+\frac{7}{15}

   =\frac{12}{15}

   =\frac{4}{5}

   d)

   40:{[11+(26-3^{3})].2}

   =40:{[11+(26-27)].2}

   =40:[(11-1).2]

   =40:(10.2)

   =40:20

   =2

   $\color{red}{\text{#DYNA}}$

    

   Trả lời
2. a) 8 . (-1/2)^4

   = 2^3 . (-1)^4/2^4

   = 1/2

   b) 5,3 . 4,7 + (-1,7) . 5,3 – 5,9

   = 5,3 . [4,7 + (-1,7)] – 5,9

   = 5,3.  3 – 5,9

   = 15,9 – 5,9

   = 10

   c) 2/3 + (-1/3) + 7/15

   = 1/3 + 7/15

   = 5/15 + 7/15

   = 4/5

   d) 40 : {[ 11 + (26 – 3^3)] . 2}

   = 40 : {[ 11 + (26 – 27)] . 2}

   = 40 : {[ 11 + (-1)] . 2}

   = 40 : {10 . 2}

   = 40 : 20

   =2

   Trả lời