1tìm x (x-73)-111=54 1500:[(30*x+40):x]=30 237-(x-11)=58 15/08/2021 Bởi Maya 1tìm x (x-73)-111=54 1500:[(30*x+40):x]=30 237-(x-11)=58
Đáp án: a, Ta có : $(x-73)-111=54$ $ <=> x – 73 = 54 + 111$ $ <=> x – 73 = 165$ $ <=> x = 165 + 73$ $ <=> x = 238$ b, Ta có : $1500:[(30.x+40):x]=30$ $ <=> (30.x + 40) : x = 1500 : 30$ $ <=> 30.x : x + 40 : x = 50$ $ <=> 30 + 40 : x = 50$ $ <=> 40 : x = 50 – 30$ $ <=> 40 : x = 20$ $ <=> x = 40 : 20$ $ <=> x = 2$c, Ta có : $237-(x-11)=58$ $ <=> x – 11 = 237 – 58$ $ <=> x – 11 = 179$ $ <=> x = 179 + 11$ $ <=> x = 190 $ Giải thích các bước giải: Bình luận
$\text{a) (x – 73) – 111 = 54.}$ $\text{⇒ x – 73 = 54 + 111.}$ $\text{⇒ x – 73 = 165.}$ $\text{⇒ x = 165 + 73.}$ $\text{⇒ x = 238.}$ $\text{Vậy x = 238.}$ $\text{b) 1500 ÷ [(30.x + 40) ÷ x] = 30.}$ $\text{⇒ (30.x + 40) ÷ x = 1500 ÷ 30.}$ $\text{⇒ (30. x + 40) ÷ x = 50.}$ $\text{⇒ 30.x ÷ x + 40 ÷ x = 50.}$ $\text{⇒ 30 + 40 ÷ x = 50.}$ $\text{⇒ 40 ÷ x = 50 – 30.}$ $\text{⇒ 40 ÷ x = 20.}$ $\text{⇒ x = 40 ÷ 20.}$ $\text{⇒ x = 2.}$ $\text{Vậy x = 2.}$ $\text{c) 237 – (x – 11) = 58.}$ $\text{⇒ x – 11 = 237 – 58.}$ $\text{⇒ x – 11 = 179.}$ $\text{⇒ x = 179 + 11.}$ $\text{⇒ x = 190.}$ $\text{Vậy x = 190.}$ Bình luận
Đáp án:
a, Ta có :
$(x-73)-111=54$
$ <=> x – 73 = 54 + 111$
$ <=> x – 73 = 165$
$ <=> x = 165 + 73$
$ <=> x = 238$
b, Ta có :
$1500:[(30.x+40):x]=30$
$ <=> (30.x + 40) : x = 1500 : 30$
$ <=> 30.x : x + 40 : x = 50$
$ <=> 30 + 40 : x = 50$
$ <=> 40 : x = 50 – 30$
$ <=> 40 : x = 20$
$ <=> x = 40 : 20$
$ <=> x = 2$
c, Ta có :
$237-(x-11)=58$
$ <=> x – 11 = 237 – 58$
$ <=> x – 11 = 179$
$ <=> x = 179 + 11$
$ <=> x = 190 $
Giải thích các bước giải:
$\text{a) (x – 73) – 111 = 54.}$
$\text{⇒ x – 73 = 54 + 111.}$
$\text{⇒ x – 73 = 165.}$
$\text{⇒ x = 165 + 73.}$
$\text{⇒ x = 238.}$
$\text{Vậy x = 238.}$
$\text{b) 1500 ÷ [(30.x + 40) ÷ x] = 30.}$
$\text{⇒ (30.x + 40) ÷ x = 1500 ÷ 30.}$
$\text{⇒ (30. x + 40) ÷ x = 50.}$
$\text{⇒ 30.x ÷ x + 40 ÷ x = 50.}$ $\text{⇒ 30 + 40 ÷ x = 50.}$
$\text{⇒ 40 ÷ x = 50 – 30.}$
$\text{⇒ 40 ÷ x = 20.}$
$\text{⇒ x = 40 ÷ 20.}$
$\text{⇒ x = 2.}$
$\text{Vậy x = 2.}$
$\text{c) 237 – (x – 11) = 58.}$
$\text{⇒ x – 11 = 237 – 58.}$
$\text{⇒ x – 11 = 179.}$
$\text{⇒ x = 179 + 11.}$
$\text{⇒ x = 190.}$
$\text{Vậy x = 190.}$