$\text{Chào bạn. Bạn tham khảo nhé !}$
$\text{Bài làm :}$ $\text{Tìm số tự nhiên x, biết :}$
$\text{a, x - 5 = 50 ÷ 2}$
$\text{x - 5 = 25}$
$\text{x = 25 + 5}$
$\text{x = 30}$
$\text{b, 30 ÷ x - 7 = 24 ÷ 3}$
$\text{30 ÷ x - 7 = 8}$
$\text{x - 7 = 30 ÷ 8}$
$\text{x - 7 = 3,75}$
$\text{x = 3,75 + 7}$
$\text{x = 10,75}$
$\text{c, 4x + 7x = 11^2}$
$\text{4x + 7x = 121}$
$\text{( 4 + 7 ) . x = 121}$
$\text{11 . x = 121}$
$\text{x = 121 ÷ 11}$
$\text{x = 11}$
$\text{d, ( x - 12 ) . ( x + 13 ) = 0
$\text{x . 13 - ( 12 + 1 ) = 0}$
$\text{x . 13 - 13 = 0}$
$\text{x . 0 = 0}$
$\text{x = 0 ÷ 0}$
$\text{x = 0}$
$\text{#I_love_Diamonds}$
$\text{#No_copy}$
$\text{Chúc bạn hok tốt nhé !}$
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