0.203dm3=cm3 1.02t=kg
905﹣260= =
= =
1.25×2.5×32= 8÷0.01=
808÷88≈ 697+296≈
①75.6×27﹣170×7.56
②
③
④
①4:5=x:25
②1+4x=6.7
③3x﹣60%x=4.32
④:3