①25+8x=65
②x÷=
③2x+x=21
+=
-=
2-=
1-=
0.8-=
0÷9.2=
2.28+7.72=
0.25×4=
①x﹣ x=15
② x÷ =
③ x+ x=
①x+=
②2x÷1.5 = 6
③5.6x-3.2x=30
④5x- =
(下)