Tìm x, biết: a) (4,5 - 2x) . 1 4/7 = 11/14 b) x/4 - x/5 = -1 1/2

a) 4,5−2.x.147=1114⇒4,5−2.x=1114:117⇒92−2.x=12⇒2.x=92−12=4⇒x=2.

b) x4−x5=−112⇒x.14−15=−32⇒x.120=−32⇒x=−32.120=−340.