题目内容
| 0.02×0.1= | 5.06x-4.07x= | 12-7.8= | a+0.4a= |
| 12÷0.3= | 4.6x+2.7x= | 1.7+0.43= | 0.58a-0.47a= |
| 1.5×0.4= | 4.8x-3.1x= | 1.25×0.2= | 12a-8.4a= |
| 64.32÷16= | 6x-4.9x= | 5.1b+11.9b= | 1.23÷3= |
| 100×0.01= | 3.4×0.07= | 3x+4x= | 0.42÷0.1= |
| 4.3b-2.7b= | 7÷0.25= | 5.1x+2.9x= | 1.75×0.8= |
| 0.3×0.4= | 5.4+1.4= | 2.7x+3.6x= | 16÷1.6= |
| 10x-3.7x= | 0.98+1.82= | 2.5x+4.3x= | 0.05×0.8= |
| 6.05x-4.96x= | 3.7a+5.2a= | 3.2÷1.6= | 3.12÷0.5= |
| 3.5+7.6= | 5.1a+3.9a= | 10×0.75= | 3b-0.7b= |
| 5.6×0.1= | x×x= | 0.9÷0.01= | 3.4b+5.6b= |
| 72.8÷0.8= | 2.7b+5b= | 3.5×3= | 7.6b-4.3b= |
| 32= | 2.52= | 4x+5x= | 3.5t-t= |
| 8a-3a= | 7b+b= | 4c-2c= | 3.5b+2.7b= |
| 0.32÷0.04= | 0.51×0.2= | 0.12+3.4= | 102= |
分析：根据小数的加、减、乘、除的方法进行计算即可．
解答：解：
| 0.02×0.1=0.002 | 5.06x-4.07x=0.99x | 12-7.8=4.2 | a+0.4a=1.4a |
| 12÷0.3=40 | 4.6x+2.7x=7.3x | 1.7+0.43=2.13 | 0.58a-0.47a=0.11a |
| 1.5×0.4=0.6 | 4.8x-3.1x=1.7x | 1.25×0.2=0.25 | 12a-8.4a=3.6a |
| 64.32÷16=4.02 | 6x-4.9x=1.1x | 5.1b+11.9b=17b | 1.23÷3=0.41 |
| 100×0.01=1 | 3.4×0.07=0.238 | 3x+4x=7x | 0.42÷0.1=4.2 |
| 4.3b-2.7b=1.6b | 7÷0.25=28 | 5.1x+2.9x=8x | 1.75×0.8=1.4 |
| 0.3×0.4=0.12 | 5.4+1.4=6.8 | 2.7x+3.6x=6.3x | 16÷1.6=10 |
| 10x-3.7x=6.3x | 0.98+1.82=2.8 | 2.5x+4.3x=6.8x | 0.05×0.8=0.04 |
| 6.05x-4.96x=1.09x | 3.7a+5.2a=8.9a | 3.2÷1.6=2 | 3.12÷0.5=6.24 |
| 3.5+7.6=11.1 | 5.1a+3.9a=9a | 10×0.75=7.5 | 3b-0.7b=2.3b |
| 5.6×0.1=0.56 | x×x=x2 | 0.9÷0.01=90 | 3.4b+5.6b=9b |
| 72.8÷0.8=91 | 2.7b+5b=7.7b | 3.5×3=10.5 | 7.6b-4.3b=3.3b |
| 32=9 | 2.52=6.25 | 4x+5x=9x | 3.5t-t=2.5t |
| 8a-3a=5a | 7b+b=8b | 4c-2c=2c | 3.5b+2.7b=6.2b |
| 0.32÷0.04=8 | 0.51×0.2=0.102 | 0.12+3.4=3.52 | 102=100 |
点评：口算题目，要求快速准确，能用简便方法的要用简便方法，注意有字母的计算．
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| 0.02×0.1= | 5.06x-4.07x= | 12-7.8= | a+0.4a= |
| 12÷0.3= | 4.6x+2.7x= | 1.7+0.43= | 0.58a-0.47a= |
| 1.5×0.4= | 4.8x-3.1x= | 1.25×0.2= | 12a-8.4a= |
| 64.32÷16= | 6x-4.9x= | 5.1b+11.9b= | 1.23÷3= |
| 100×0.01= | 3.4×0.07= | 3x+4x= | 0.42÷0.1= |
| 4.3b-2.7b= | 7÷0.25= | 5.1x+2.9x= | 1.75×0.8= |
| 0.3×0.4= | 5.4+1.4= | 2.7x+3.6x= | 16÷1.6= |
| 10x-3.7x= | 0.98+1.82= | 2.5x+4.3x= | 0.05×0.8= |
| 6.05x-4.96x= | 3.7a+5.2a= | 3.2÷1.6= | 3.12÷0.5= |
| 3.5+7.6= | 5.1a+3.9a= | 10×0.75= | 3b-0.7b= |
| 5.6×0.1= | x×x= | 0.9÷0.01= | 3.4b+5.6b= |
| 72.8÷0.8= | 2.7b+5b= | 3.5×3= | 7.6b-4.3b= |
| 32= | 2.52= | 4x+5x= | 3.5t-t= |
| 8a-3a= | 7b+b= | 4c-2c= | 3.5b+2.7b= |
| 0.32÷0.04= | 0.51×0.2= | 0.12+3.4= | 102= |
| 9.5×100= | 1.25×8 | 0.25×0.9×4= | 1.87×0= |
| 3.5-1.5= | 1.2×0.4= | 3.6×0.5= | 0.6×5= |
| 0.24+0.6= | 0.64×0.03= | 7.8+2.2-1.5= | 8×0.05= |
| 0.125×8= | 1.3×4= | 0.4×0.6= | 3×0.08= |
| 0.35×2= | 2.9×0.3= | 10-0.9= | 5.67×0= |
| 0.8×0.01= | 2.5×0.2= | 2.4×0.3= | 1.6×0.25= |
| 0.17×0.3= | 15×0.01= | 10×0.07= | 0.7×0.05= |
| 0.2×0.05= | 7.8×0.01= | 0.2×0.26= | 0.04×4= |
| 12.4+2.1= | 0.08×0.5= | 0.14×4= | 9×2.5+9×1.5= |
| 1.8×0.5= | 2.3×5= | 0.3×3.6= | 8×0.9+8×2.1= |
| 2.5×4= | 0.8+2.7×2= | 0.05×7= | 4.8+2.1+7.9= |
| 3.4-1.8= | 2.5+0.2×2= | 0.02×0.1= | 5.4-2.8= |
| 0.3×0.2= | 3.5×2×0.1= | 0.3×0.3= | 0×10.3×2.2= |
| 0.12×0.7= | 0.2×0.5= | 0.92×0.4= | 6.7-1.43= |
| 1.2×4= | 1.3×2= | 1.2×0.3= | 4.6+5.08= |