+x=0.75
9x-=
★1-x=
=
2-1÷6=
①24.8-x=7.2
②6x+21x=540
③1.6x÷0.5=25.6
④9x-4.5=7.2
⑤x÷5.6=1.4
⑥3.5×0.6+x=7.5
(+)×9= 1.5×100= 99×0.8+0.8= 42=
+= 7﹣= ×= ÷=