1. X : 10 = ![](https://wkrtcs.bdimg.com/rtcs/image?w=33.33&md5sum=7a75e983e0faac33c70c71b46c2bc8ad&sign=ad9e478585&rtcs_flag=2&rtcs_ver=3.1&l=webapp&bucketNum=91&ipr={"t":"img","r":"r_3","w":"33.33","h":"57.33","dataType":"gif","c":"word/media/image1.gif"})
: 2. : = : X 3. 0.4 : X = 1.2 : 2
4. ![](https://wkrtcs.bdimg.com/rtcs/image?w=33.33&md5sum=7a75e983e0faac33c70c71b46c2bc8ad&sign=ad9e478585&rtcs_flag=2&rtcs_ver=3.1&l=webapp&bucketNum=91&ipr={"t":"img","r":"r_3","w":"33.33","h":"56.00","dataType":"gif","c":"word/media/image6.gif"})
: X = 3 : 12 5. = 6. 1.25 : 0.25 = X : 1.6
7. X : ![](https://wkrtcs.bdimg.com/rtcs/image?w=33.33&md5sum=7a75e983e0faac33c70c71b46c2bc8ad&sign=ad9e478585&rtcs_flag=2&rtcs_ver=3.1&l=webapp&bucketNum=91&ipr={"t":"img","r":"r_3","w":"33.33","h":"56.00","dataType":"gif","c":"word/media/image9.gif"})
= 6: 8. 9. 2.8 : 4.2 = X : 9.6
10. ![](https://wkrtcs.bdimg.com/rtcs/image?w=90.67&md5sum=7a75e983e0faac33c70c71b46c2bc8ad&sign=ad9e478585&rtcs_flag=2&rtcs_ver=3.1&l=webapp&bucketNum=91&ipr={"t":"img","r":"r_3","w":"90.67","h":"57.33","dataType":"gif","c":"word/media/image12.gif"})
: 11. : = X : 12. 0.6 : 4 = 2.4 : X
13. ![](https://wkrtcs.bdimg.com/rtcs/image?w=42.67&md5sum=7a75e983e0faac33c70c71b46c2bc8ad&sign=ad9e478585&rtcs_flag=2&rtcs_ver=3.1&l=webapp&bucketNum=91&ipr={"t":"img","r":"r_3","w":"42.67","h":"56.00","dataType":"gif","c":"word/media/image17.gif"})
= X : 14. = : X 15. X : = 0.7 :
16. 1.3 : X = 5.2 : 20 17. ![](https://wkrtcs.bdimg.com/rtcs/image?w=33.33&md5sum=7a75e983e0faac33c70c71b46c2bc8ad&sign=ad9e478585&rtcs_flag=2&rtcs_ver=3.1&l=webapp&bucketNum=91&ipr={"t":"img","r":"r_3","w":"33.33","h":"57.33","dataType":"gif","c":"word/media/image2.gif"})
: = : X 18. =
19. X - ![](https://wkrtcs.bdimg.com/rtcs/image?w=33.33&md5sum=7a75e983e0faac33c70c71b46c2bc8ad&sign=ad9e478585&rtcs_flag=2&rtcs_ver=3.1&l=webapp&bucketNum=91&ipr={"t":"img","r":"r_3","w":"33.33","h":"56.00","dataType":"gif","c":"word/media/image26.gif"})
X = 20. 70%X + 20%X = 3.6 21. X×= 20×
22. X－15%X = 68 23. ![](https://wkrtcs.bdimg.com/rtcs/image?w=33.33&md5sum=7a75e983e0faac33c70c71b46c2bc8ad&sign=ad9e478585&rtcs_flag=2&rtcs_ver=3.1&l=webapp&bucketNum=91&ipr={"t":"img","r":"r_3","w":"33.33","h":"56.00","dataType":"gif","c":"word/media/image28.gif"})
X－X = 24. X÷=÷
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