题目列表(包括答案和解析)
| 10×50= | 180÷2= | 5-2.1= | 70×70= |
| 4200÷7= | 9.7+0.3= | 13×20= | 450÷5= |
| 21×30≈ | 48×29≈ | 207÷5≈ | 290÷9≈ |
| 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| 37-21= | 850÷100= |  = |  = |
 = |  = | 12×5= | 4.4×1.1= |
 = |  = | 36÷3= | 3-2.55= |
 = |  = | 210×10= |  = |
 = | 0.95=________% | 9.5-8.7= |  = |
0÷ = | 1.12=________% | 0.6+0.13= |  = |
2× = |  =________% | 0.4×0.9= |  = |
 = |  =________% | 2.4÷0.3= |  = |
 ×24= | 75%= | 1.2-1.16= |  = |
| 9÷8= | 15%=． |
| χ-19.6=10.4 | X+24.5=73.9 | 13χ-8χ=10.5 |
| χ÷9=21 | 2.4m=9.6 | 0.2x-3=7.5． |
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