(1)1.3÷x=0.52, 1.3÷x×x=0.52×x, 1.3=0.52x, 0.52x=1.3, 0.52x÷0.52=1.3÷0.52, x=2.5; (2)10.2-5x=2.2, 10.2-5x+5x=2.2+5x, 10.2=2.2+5x, 2.2+5x=10.2, 2.2+5x-2.2=10.2-2.2, 5x=8, 5x÷5=8÷5, x= 8 5