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) \(224 + (138 - x) = 347\)
\(138 - x = 347 - 224\)
\(138 - x = 123\)
\( x = 138 - 123\)
\(x = 15\)
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c) \(147 - (2x - 53) = 32\)
\( 2x - 53 = 147 - 32\)
\( 2x - 53 = 115\)
\(2x = 115 + 53 \)
\( 2x = 168\)
\(x = 168 : 2 \)
\(x = 84\)
d) \(2.(15 - x) + 42 = 50\)
\(2.(15 - x) = 50 - 42\)
\(2.(15 - x) = 8\)
\(15 - x = 8 : 2\)
\( 15 - x = 4\)
\(x = 15 - 4\)
\( x = 11\)