(\(\frac{25}{5^2}\times30\)) : 15 x 7

= (1 x 30) : 15 x 7

= 30 : 15 x 7

= 2 x 7

= 14

mn giúp mình nha

12
−
{
800
:
[
537
−
(
2
5
+
15.7
)
]
}
.1
2021
12
−
{
800
:
[
537
−
(
2
5
+
15.7
)
]
}
.1
2021

=
12
−
{
800
:
[
537
−
(
32
+
105
)
]
}
=
12
−
[
800
:
(
537
−
137
)
]
=
12
−
(
800
:
400
)
=
12
−
2
=
10
=
12
−
{
800
:
[
537
−
(
32
+
105
)
]
}
=
12
−
[
800
:
(
537
−
137
)
]
=
12
−
(
800
:
400
)
=
12
−
2
=
10

\(=12-32\cdot\left\{800:407\right\}=12-32\cdot\dfrac{800}{407}=\dfrac{-20716}{407}\)

Sửa đề: \(12-800:\left\lbrace537-\left\lbrack537-\left(2^5+15\cdot7\right)\right\rbrack\right\rbrace-1^{2021}\)

Ta có: \(12-800:\left\lbrace537-\left\lbrack537-\left(2^5+15\cdot7\right)\right\rbrack\right\rbrace-1^{2021}\)

\(=12-800:\left\lbrace537-537+\left(2^5+15\cdot7\right)\right\rbrace-1^{2021}\)

\(=12-800:\left\lbrace\left(2^5+15\cdot7\right)\right\rbrace-1^{}\)

\(=11-\frac{800}{32+105}=11-\frac{800}{137}=\frac{707}{137}\)

3.5² + 15.7² - 8³ : 2

= 3.25 + 15.49 - 512 : 2

= 75 + 735 - 256

= 810 - 256

= 554

3.5² + 15.7² - 8³ : 2

= 3.25 + 15.49 - 512 : 2

= 75 + 735 - 256

= 810 - 256

= 554

2.3².{2².15.7:6+[ 150-(68.2-2³.5)]}

= 2.3².{2².15.7:6+[150-(136-8.5)]}

=2.3².{2².15.7:6+[150-(136-40)]}

=2.3².{2².15.7:6+[150-96]}

=2.3².{2².15.7:6+54}

=2.3².{4.15.7:6+54}

=2.3².{60.7:6+54}

=2.3².{420:6+54}

=2.3².{70+54}

=2.3².124

=2.9.124

=18.124

=2232

K mk na <3

Ta có:

 [7^5. (15 + 6) : 7^6

=(7^5 . 21) : 7^6

=(7^5 . 7 . 3) : 7^6

=(7^6 . 3) : 7^6

=3

( 15 . 7 ^ 5 + 6 . 7 ^ 5 ) : 7 ^ 6

= ( 15 . 7⁵ + 6 . 7⁵ ) : 7⁶

= ( 252105 + 100842 ) : 7⁶

= 352947 : 7⁶

= 3