328+199= 2.4+3.06= 24×12.5%= 4﹣﹣=
﹣= 3.2÷0.01= 3.5:1.4=﹣=
x﹣1=0.2
x:=21:
50%x+x=15
0.1-0.01= 6.8÷10%= 3.6÷0.12= 398÷42≈
0.22= × = 24÷ = ×4÷ ×4=
①42×()
②7.5×(26-10)+9.7
③0.8×4×12.5×2.5
④÷[1-(+0.25) ]
①
②36×()
③
④
⑤3.24×0.76+3.24×0.24
⑥