①752+539
②15396÷12
③384×512
④873-459+866
⑤4478×23÷46
⑥564×48-5492
803-207= ÷5= 798+150= + =
0.25×8= 1.5- = 7.5÷ = 0.77+0.3=
9.8-8= × = 45.54÷45= 24× =