、0.142、14.3%、0.
．这四个数中最大的数是________，最小的数是________．| 1.8+0.5= | 2.5-0.1= | 4.8-0.2= | 74+71= |
| 48+10= | 24÷12= | 68÷0.68= | 94.7÷0.1= |
| 61.8÷0.6= | 0.8×6.7= | 3÷8= | 0.12×3= |
| 32= | 8.2-2.8= | 3.5÷0.7= |  = |
 = |  = | 5.3+0.5= | 46+18= |
| 8.5-1.5= | 69+10= | 28.8+0.4= | 40.5÷0.5= |
| 92.7÷0.3= | 0.5×1.3= | 16×0.5= | 4.4+0.1= |
| 6.1-0.1= | 3.3+0.6= | 33.2÷0.4= | 1÷0.25= |
| 1.5×4= | 6.5+1.35= | 1.3-1.2= |  = |
 = |  = | 5.7-1.7= | 0.35+0.75= |
| 0.2×1.1= | 1.6÷0.4= | 10÷4= | 3.4÷0.2= |
| 52÷13= | 57÷19= | 3.7-0.8= | 29+92= |
| 8.2+0.7= | 6.5-5.6= | 4.8÷0.3= | 33= |
| 1.25×8= |  = |  = |  = |
| 2.1÷0.3= | 3.2×3= | 2.8-1.8= | 0.9×6.2= |
解下列方程
① x= | ②x÷ = | ③ x+ x=1． |
直接写出得数
| 50×5= | 49+35= | 21×4= | 900×9= | - = |
| 45÷6= | 71×2≈ | 102×6≈ | 340+470= | 11÷2= |
如图（ ）中是钝角．