0.1-0.01= 6.8÷10%= 3.6÷0.12= 398÷42≈
0.22= × = 24÷ = ×4÷ ×4=
650+200= 78-3.2= 18×0.4= 2÷0.05=
+= 1-= ×= ÷=
①37.6﹣4.87﹣1.13 ②47×2.8+52×2.8+2.8 ③40÷[×(+)]
328+199= 2.4+3.06= 24×12.5%= 4﹣﹣=
﹣= 3.2÷0.01= 3.5:1.4=﹣=