=> (42-x). 5= 125
=> (42-x)=125: 5
=> (42-x)=25
=> x=42-25
=>x= 17
21.43 -27.21
=21. (43-27)
=21.16
=336
\(\left(42-x\right).5=5^3\)
\(\Rightarrow42-x=5^3:5\)
\(\Rightarrow42-x=5^2\)
\(\Rightarrow42-x=25\)
\(\Rightarrow x=42-25\)
\(\Rightarrow x=17\)
a/ (42-x).5=53
=> 42-x=53:5
=> 42-x=52
=> 42-x=25 => x=42-25
=> x=17
b/ 21.43-27.21=21.(43-27)=21.16=336
Đáp số: 336
\(21.43-27.21\)
\(=21.\left(43-27\right)\)
\(=21.16\)
\(=336\)
(42 - x).5 = 5^3
(42 - x ).5=125
42 - x = 125 : 5
42 - x = 25
21.43 - 27.21
= 21.(43-27)
=21 . 16
= 336
(42 - x).5 = 5^3
(42 - x).5 = 125
42 - x = 125 : 5
42 - x = 25
x = 42 - 25
x = 17
21.43 - 27.21
= 21.(43-27)
= 21. 16
= 336