Question

1.Tính

x-6=11

\(\dfrac{254.399-145}{254+399.253}\)

Answer 1

x-6=11

<=>x=11+6

=>x=17

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Answer 2

\(a,x-6=11\)

\(x=11+6\)

\(\Rightarrow x=17\)

\(b,\dfrac{254.399-145}{254+399.253}=\dfrac{\left(253+1\right).399-145}{254+399.253}\)

\(=\dfrac{253.399+399-145}{254+399.253}\)

\(=\dfrac{253.399+254}{254+399.253}\)

\(=1\)