① × + ÷
② × + ÷5
③18-5 -
④99×
⑤14:0.5=4:x
⑥15x-2.4x=37.8
72×0.03+0.3×2.8 ÷+× 4.5÷÷
×48 -(4.375-) ÷(-0.375-)
3x+6=12.6 :x=:
①714÷21+24×5
②0.25×3.2×1.25
③(0.52×2.4)÷(0.8×2.6)
④÷7+×
⑤17×11×(+)
⑥解比例:=x:25
①-÷-
②×+÷8
③(×27-)×
④÷[(+)×]
7.2:x=
解:3.6x=57.6
3.6x÷3.6=57.6÷3.6
x=16
×7+10÷+
:x=