Câu trả lời:
a) 23x−23=712−1⇔23x=712−1+23=14⇔x=3823x−23=712−1⇔23x=712−1+23=14⇔x=38
b)12x+35(x−2)=3⇔12x+35x−65=3⇔1110x=215⇔x=421112x+35(x−2)=3⇔12x+35x−65=3⇔1110x=215⇔x=4211
c)
34|x+5|+78=116⇔34|x+5|=76−78=724⇔|x+5|=718⇔⎡⎢ ⎢⎣x+5=718x+5=−718⇔⎡⎢ ⎢⎣x=−8318x=−9718