Câu hỏi:
Tìm x biết: \(\left( {256 – 75} \right) + \left( { – 234 + 342} \right)x = – 35\)
-
A.
x = -2 -
B.
x = -3 -
C.
x = -4 -
D.
x = -5
Lời giải tham khảo:
Đáp án đúng: A
Ta có:
\(\begin{array}{l} \ \,\left( {256 – 75} \right) + \left( { – 234 + 342} \right)x = – 35\\\,\,\,\,\,\,181 + 108x = – 35\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,108x = – 35 – 181\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,108x = – 216\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = \left( { – 216} \right):108\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x = – 2\end{array}\)
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