(5-x)*3=(7-x)*2 x*（1-0.2）=145-x+8 x*6+x（1+0.1）*5=1518 9+x =(36+x)*0.4

RELATED INFORMATIONS

• 1. 8 / x = 0.36 / 0.6
• 2. X: 3.5 = 1.4:5.6, 1 / 2:1 / 5 = x: 1 / 10, 36 / x = 1.8:5, 2 / 5: x = 8 / 7:10, 3.6:0.9 = x: 0.15, X: 3 / 5 = 3 / 8:0.05 X: 3.5 = 1.4:5.6, 1 / 2:1 / 5 = x: 1 / 10, 36 / x = 1.8:5, 2 / 5: x = 8 / 7:10, 3.6:0.9 = x: 0.15, X: 3 / 5 = 3 / 8:0.05
• 3. (x+8)(x+6)(x+7)+(x+5)(x+6)(x+7)=(x+5)(x+8)(x+7)+(x+5)(x+8)(x+6)
• 4. 3: How to solve the equation? 30% × 2.5 + 3 / 10 × 3.7 + 0.3 × 3.7 is simple and convenient
• 5. The solution equation: 2.1 △ x = 0.3, 7.2-x = 4.3, x-0.84x = 0.8, 30 × (x △ 4) = 60, 84 + x = 10.2
• 6. Fill in the blanks: 1, 81, 64, 49, (), 25, (), () 2, 2, 3, 5, 8, (), (), 34
• 7. 1. Fill in the blanks according to the rules, （2）1,8,27,（）125,（） 2 (1) find the unknown X 5 / 3 x + 1 / 10 x = 7 / 5 5x-2.1 small X4 = 9.6 (4-1.6)x=36 2X divided by 5 = 15
• 8. The rules of 100, 81, 49, 36, (), 16, () are as follows
• 9. Find the rule 1,4,16,36,64100, ()
• 10. Find the rule: 2, - 4.6, - 8.10, 12.14, - 16, what are the 99th and 100th numbers? Explain why
• 11. （-7/12-5/6+9/8-3/4）x（--36）
• 12. Given 1 + X + x ^ 2 + x ^ 3 = 0, find the value of X + x ^ 2 + x ^ 3 + x ^ 4 + x ^ 5 + x ^ 6 + x ^ 7 + x ^ 8 If not, how much?
• 13. (1) (- 1 / 12-1 / 36 + 3 / 4-1 / 6) * (- 48) (2) - 3 / 17 △ 3 * (17 / 5)) (3) - 5 ÷ (- 1 and 2 / 7) * 4 / 5 * (- 2 and 1 / 4) / 7 (4) - 2 of 13 * 3-0.34 * 2 of 7 + 1 of 3 * (- 13) - 5 of 7 * 0.34 (5) (- 1 / 6) / (2 / 3 1-3 / 3 2 + 1 / 15 4)
• 14. The sum of the two addends is 98. One addend increases by 7.36 and the other decreases by 5.5. What is the sum?
• 15. Simple calculation (- 98) * (- 0.125) + 98 * 1 / 8 * (- 4 / 7) (- 1 / 12-1 / 36 + 3 / 4-1 / 6) * (- 36) - 19 and 24 / 25 * (- 5)
• 16. According to 1 / 2 = 1 / 5 + 3 / 10, 1 / 3 = 1 / 7 + 4 / 21, 1 / 4 = 1 / 9 + 5 / 36, how to write 1 / 9 = 1 / () + 10 / (), 1 / 8 = 1 / () + 9 / (),
• 17. 1. What are the rules between them? What are the rules between them?
• 18. 1999! + 1 is prime or composite
• 19. Detailed explanation of number reasoning 78,38,18,10,4, () 78,38,18,10,4,() Four alternative answers 2,1,4,3
• 20. What's 18.38 N and 78.59 e