2 câu trả lời
1112−(25+x)=2325+x=23−111225+x=−14x=−14−25=−1320.34+14:x=2314:x=23−3414:x=−112x=14:−112=−3.
a) 11/12 - (2/5 + x) = 2/3
<-> 11/12 - 2/5 - x = 2/3
<-> 55/60 - 24/60 - x - 46/60 = 0
<-> x = -1/4
b) 3/4 + 1/4 :x = 2/3
<-> 1/4:x = 2/3 - 3/4
<-> 1/4:x = 8/12 - 9/12
<-> 1/4:x = -1/12
<-> x = 1/4 : (-1/12)
<-> x = -3.
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