1. Tìm x: ( x – 1/2 )^3 = 1/27 2. Tính: 4 . ( 1/4 )^2 + 25 . [ ( 3/4 )^3 : ( 5/4 )^3 ] : ( 3/2 )^3 07/07/2021 Bởi Maria 1. Tìm x: ( x – 1/2 )^3 = 1/27 2. Tính: 4 . ( 1/4 )^2 + 25 . [ ( 3/4 )^3 : ( 5/4 )^3 ] : ( 3/2 )^3
( x – $\frac{1}{2}$ )^3 = $\frac{1}{27}$ ( x – $\frac{1}{2}$ )^3 =($\frac{1}3)^{3}$ x – $\frac{1}{2}$=$\frac{1}{3}$ x=$\frac{5}{6}$ ( $\frac{1}{4}$ )^2 + 25 . [ ( $\frac{3}{4}$ )^3 : ($\frac{5}{4}$ )^3 ] : ( $\frac{3}{2}$ )^3 =( $\frac{1}{4}$ )^2 +$5^{2}$ .(($\frac{2}{5}$) ^3 =$\frac{1}{10}$ Bình luận
(x-1/2)3=1/27 (x-1/2)3=(1/3)3 x-1/2=1/3 x=5/6 4 . ( 1/4 )^2 + 25 . [ ( 3/4 )^3 : ( 5/4 )^3 ] : ( 3/2 )^3 = 4 . 1/16 + 25 . [ 27/64 : 125/64 ] : 27/8 = 1/4 + 25 . 3375/4096 : 27/8 = 1/4 + 3125/512 = 3253/512 Bình luận
( x – $\frac{1}{2}$ )^3 = $\frac{1}{27}$
( x – $\frac{1}{2}$ )^3 =($\frac{1}3)^{3}$
x – $\frac{1}{2}$=$\frac{1}{3}$
x=$\frac{5}{6}$
( $\frac{1}{4}$ )^2 + 25 . [ ( $\frac{3}{4}$ )^3 : ($\frac{5}{4}$ )^3 ] : ( $\frac{3}{2}$ )^3
=( $\frac{1}{4}$ )^2 +$5^{2}$ .(($\frac{2}{5}$) ^3
=$\frac{1}{10}$
(x-1/2)3=1/27
(x-1/2)3=(1/3)3
x-1/2=1/3
x=5/6
4 . ( 1/4 )^2 + 25 . [ ( 3/4 )^3 : ( 5/4 )^3 ] : ( 3/2 )^3
= 4 . 1/16 + 25 . [ 27/64 : 125/64 ] : 27/8
= 1/4 + 25 . 3375/4096 : 27/8
= 1/4 + 3125/512
= 3253/512