52-x=15 10.2-5x=2.2 8x-5x=27
(x+2.5)×4=15 3×1.5+6x=33
7.2÷16= 0.72÷0.16= 7.2÷0.045=
①10.25÷0.25÷0.4
②(9.6+2.4)÷0.8
③0.45×18÷0.15
④79.5÷0.75+0.25
⑤16.2÷(48.6-8.1)×1.5