Advertisements (Quảng cáo)
Tìm số tự nhiên x, biết :
a) \((x – 47) – 127 = 0\)
b) \(224 + (138 – x) = 347\)
c) \(147 – (2x – 53) = 32\)
d) \(2 . (15 – x) + 42 = 50.\)
a) \((x- 47) – 127 = 0\)
\(x – 47 = 127\)
\(x = 127 + 47\)
\(x = 174\)
b) \(224 + (138 – x) = 347\)
\(138 – x = 347 – 224\)
\(138 – x = 123\)
\( x = 138 – 123\)
\(x = 15\)
Advertisements (Quảng cáo)
c) \(147 – (2x – 53) = 32\)
\( 2x – 53 = 147 – 32\)
\( 2x – 53 = 115\)
\(2x = 115 + 53 \)
\( 2x = 168\)
\(x = 168 : 2 \)
\(x = 84\)
d) \(2.(15 – x) + 42 = 50\)
\(2.(15 – x) = 50 – 42\)
\(2.(15 – x) = 8\)
\(15 – x = 8 : 2\)
\( 15 – x = 4\)
\(x = 15 – 4\)
\( x = 11\)