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 / (),

1/9=1/19+10/171 1/8=1/17+9/136

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1. Simple calculation (- 98) * (- 0.125) + 98 * 1 / 8 * (- 4 / 7) (- 1 / 12-1 / 36 + 3 / 4-1 / 6) * (- 36) - 19 and 24 / 25 * (- 5)
2. 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?
3. (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)
4. 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?
5. （-7/12-5/6+9/8-3/4）x（--36）
6. (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
7. 8 / x = 0.36 / 0.6
8. 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
9. (x+8)(x+6)(x+7)+(x+5)(x+6)(x+7)=(x+5)(x+8)(x+7)+(x+5)(x+8)(x+6)
10. 3: How to solve the equation? 30% × 2.5 + 3 / 10 × 3.7 + 0.3 × 3.7 is simple and convenient
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