One and a half minus one and a half plus two-thirds

The original formula is 1 and 3 / 6 + 4 / 6 - 1 and 3 / 5
=1 and 7-1 and 3-5
=35 / 30-18 / 30
=17 out of 30

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1. One and half minus 1.6 plus two thirds
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3. 5 of 6 × 4.7 + 5.3 △ 6 of 5 12 minus 3 of 4 × 21 of 20 minus 2 of 7, 1 of 2 + 2 × = 6.5
4. How much is 7 / 4 times 21 times 5 / 16
5. 1. (1) Rewrite 7-3.18 = 3.82 into one addition and one subtraction. 2. Rewrite 7 * 21 / 5 = 15 into two division
6. How to divide X by five equals 14 out of 15
7. 14 / 15 divided by 7 is equal to? ………………………………
8. What is a number whose square equals one in 49
9. If the square of a number is 49 out of 36, then the number is_____ .
10. On the limit problems of Higher Mathematics If the real number B satisfies | B | 1, LIM (1 + B + B ^ 2... + B ^ (n-1)) / b ^ n =? If sequence {an} 1 / N ^ 2 1 ≤ n ≤ 1000 n ^ 2 / (n ^ 2-2n) n ＞ 1001, then {an} limit value A. 0b, 1C, 0or1d, not present Thank you The second point is that the two cases are divided into braces
11. 16 out of 17 minus 2 out of 19 times 16 out of 17
12. 7 / 3 times 5 / 9 minus 4 / 9 times 4 / 3
13. How much is twenty-three times seventeen sixteen plus sixteen times seventeen
14. How much is 8 / 17 / 23 + 1 / 23 * 9 / 11
15. How about 17 out of 20 minus 8 out of 9 plus 3 out of 20? Simple calculation?
16. Simple calculation (224 + 1 / 222) X1 / 223 1 / 128 + 1 / 64 + 1 / 32 +... + 1 / 4
17. How much is 224 plus 222 one times 223 one
18. (224 + 1 / 222) * 1 / 223 simple operation Hurry!
19. (224 + 1 / 222) times 1 / 223,
20. （224+1/222）*1/223 "/" is a semicolon and "*" is a multiplication sign