解方程.(1)x÷0.26=0.52
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解方程:(1)x÷0.26=0.52

x÷0.26×0.26=0.52×0.26,

x=0.1352;

(2)9x-2x=21.7,

7x=21.7,

7x÷7=21.7÷7,

x=3.1;

(3)3.18×2-2x=4.26,

6.36-2x=4.26,

2x=6.36-4.26,

2x÷2=2.1÷2,

x=1.05;

(4)0.25x+3.75=12.

0.25x+3.75-3.75=12-3.75,

0.25x÷0.25=8.25÷0.25,

x=33.