I wonder if (51 + 42) X4 has a simple operation

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• 1. (3 / 5 + 2.4 / 2 / 3) / 0.7 simple algorithm
• 2. Simple calculation of four fifths × 7.4 + 3.6 × 0.8 - four fifths
• 3. -(- 5 and a quarter) + (- 3 and a seventh) + (- 5 and a quarter) - (- 12 and a seventh) (it's better to use a simple method) please
• 4. What is the meaning of two thirds by one seventh
• 5. One by three plus three by five plus five by seven plus Add bracket two n minus one bracket two N plus one?
• 6. - 18 + 21 △ 7 × 1 / 7
• 7. How much is one eighth minus one fourth
• 8. 1、 4 / 8 () 20.2 () 8 / 15 / 3 m () 6 cm 2、 A = 3 × 5 × 7, B = 3 × 5 × 11, the least common multiple of a and B is ()? A.15 B.1155 C.105 If the denominator of a fraction is multiplied by 4, and the size of the fraction remains unchanged, the numerator factor ()? A. Multiply 4 B. divide 4 C. don't change
• 9. [12 - {1 / 8 + 3 / 16}] / / 9 / 4
• 10. 100 square meters is 10 meters long and 10 meters wide. How do you calculate that
• 11. 1+2+3+5+6+78+989+454+324+4423=?
• 12. Solution equation: 0.75-x = 10.6 of 8 * (x-0.6) = 0.6
• 13. (1-2 / 5) x 13 = (1 1 / 4) x solves the equation
• 14. The solution equation: X △ 2 + (10-x) △ 3 = 4 There should be a process
• 15. Equation 10.5-2x = 2.1
• 16. Can (1.98 + 2.79) / 0.9 be easily calculated
• 17. How much is x (X-2) / x + 2 minus X-1?
• 18. After one ninth of the number of class 52 was transferred to class 5.1, the number of class 1 was 75% of that of class 2
• 19. 2/3+4/5+8/9+16/17+32/33+64/65+128/129+256/257+512/513=?
• 20. 20-5/2-9/4-17/8-33/16-65/32-29/64=?