摘要: ( )+8=11 ( )+5=14 8+( )=15 9+( )=18
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在18的因数上画▲在30的因数上画○
18和30的公因数有 ,最大公因数是 .
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| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| 80÷10= | 18×4= | 130×3= | 37×6= | 120÷60= |
| 25×4= | 2×240= | 200×10= | 360×30= | 78÷3= |
| 350×4= | 7×23= | 2600×0= | 350×50= | 123÷3= |
| 3333÷11= | 307×4= | 218×9= | 7×230= | 20×351= |
| 60×12= | 14×70= | 230×7= | 436÷4= | 444÷4= |
| 123+45= | 5600+45= | 506-87= | 980-806= | 425×2= |
| 237×7= | 907-289= | 300×30= | 190×5= | 25×30= |
| 77÷11= | 20×50= | 12×5= | 12-10÷2= | 290×20= |
| 40+25-12= | (30-15)×20= | 16+4×8= | 300-100÷5= | 44+44×5= |
| 309÷3-3= | (429+11)÷4= | 21×40+120= | 190×5-190= | 305×50+2= |
| 200×7-175= | 180×50= | 500×10= | 10×550= | 19×300= |
| 12×(345+55)= | 700-(390+10)= | 111÷(231-230)= |
一个5×5的方格纸,每个小方格已编上号码(如图),挖去一个小方格后可以剪成8个1×3的长方形.请问应挖去方格是几号
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| 1 | 2 | 3 | 4 | 5 |
| 6 | 7 | 8 | 9 | 10 |
| 11 | 12 | 13 | 14 | 15 |
| 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 | 25 |
| 80÷10= | 18×4= | 130×3= | 37×6= | 120÷60= |
| 25×4= | 2×240= | 200×10= | 360×30= | 78÷3= |
| 350×4= | 7×23= | 2600×0= | 350×50= | 123÷3= |
| 3333÷11= | 307×4= | 218×9= | 7×230= | 20×351= |
| 60×12= | 14×70= | 230×7= | 436÷4= | 444÷4= |
| 123+45= | 5600+45= | 506-87= | 980-806= | 425×2= |
| 237×7= | 907-289= | 300×30= | 190×5= | 25×30= |
| 77÷11= | 20×50= | 12×5= | 12-10÷2= | 290×20= |
| 40+25-12= | (30-15)×20= | 16+4×8= | 300-100÷5= | 44+44×5= |
| 309÷3-3= | (429+11)÷4= | 21×40+120= | 190×5-190= | 305×50+2= |
| 200×7-175= | 180×50= | 500×10= | 10×550= | 19×300= |
| 12×(345+55)= | 700-(390+10)= | 111÷(231-230)= |