摘要：(1)7.56+13.8+2.44+5.2 (2)156×72+28×156
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| A | 1 | 6 | 7 | 12 | 13 | … |
| B | 2 | 5 | 8 | 11 | 14 | … |
| C | 3 | 4 | 9 | 10 | 15 | 16 |
（2）73在哪一组里？
（3）C组第56个数是几？
| 8.4÷0.7= |
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0.25×4= | 3-
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4.8×
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3.37+6.63= |
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| 1-100%= | 3.6×
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0.5-
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12.6÷3= | 1.02-0.43= | ||||||||||||
1÷
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10-1.34-3.66= | 8÷
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7+0÷7-7= |
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神机妙算细又巧！
14.64+3.7×2.8
72.5×0.4-81.2÷56
13.8×0.45+138×0.055
（1.5÷4）÷（0.15÷4）
（1.25+1.25+1.25+1.25）×0.8×0.25．
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14.64+3.7×2.8
72.5×0.4-81.2÷56
13.8×0.45+138×0.055
（1.5÷4）÷（0.15÷4）
（1.25+1.25+1.25+1.25）×0.8×0.25．
| 0.56÷0.04= | 1.44÷2= | 24.6÷0.6= | 4.5÷0.15= |
| 0.63÷0.09= | 12.84÷1.2= | 3.9÷0.13= | 1.6÷1.6= |
| 20÷0.25= | 1.3÷2.5= | 100÷12.5= | 7.8÷0.13= |
| 3.24÷0.8= | 13×1.1= | 5.46÷3= | 4.07×3= |
| 5.28t-1.99t= | 0.6+89= | 5.7×0.1= | 1.6÷0.4= |
| 6÷0.3= | 5÷0.25= | 0.45×3= | 0.35×8= |
| 7.1-0.76= | 1.2×0.3= | 0.76÷4= | 1.9×0.8= |
| 4.2-2.8= | 7.2÷1.6= | 19.8+3.2= | 18-17.45= |
| 4.5+1.5= | 0.75x+0.25x= | 2.5×4= | 0.46÷2= |
| 0.7×1.4= | 1-0.92= | 8×0.125= | 3.4÷20= |
| 10a-1.8a= | 4.8×0.2= | 0.3÷0.15= | 0.15÷2= |
| 0.2×0.5= | 2.2-1.8= | 3.1+1.75= | 32.8+1.9= |
| 0.42×0.5= | 0.76+1.24= | 3.06-0.72= | 0.51÷17= |
| 5.2÷13= | 8.2×0.01= | 1.72-0.73= | 1.6×0.4= |
| 4.8b+3.2b= | 2.5×4= | 0.3×101= | 1.2×0.5= |
| 450-140= | 25÷7= | 900+238= | 600-9×8= | ||||||||||||||
| 90-7×5= | 26+30-28= | 48÷（2+4）= | 780-772= | ||||||||||||||
| 26+24= | 80-30= | 78-26= |
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(
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0.25×2.69×4= | 10-2.87-7.13= |
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3÷
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0.87-0.49 | 4.9×0.7= |
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2+
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| （25+4）×4= | 12.37-3.25-6.75= | 3/14×6= | 0.51÷17= | ||||||||||||||
| 14-7.4= | 5.2÷1.3= | 25×12= |
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2.5-2= | 36-29= | 120÷4= | ||||||||||||||
| 300+25= | 630-30= | 4×50= | 15.9+10.8= | ||||||||||||||
| 26×13= | 24÷4+56÷4= | 8-2.5= | 12×2.5= | ||||||||||||||
| 2吨50千克= 2.05 2.05 吨． |