What can be calculated simply should be calculated simply 3 / 5-3 / 7 + 2 / 5 + 3 / 7

3 / 5 + 2 / 5 = 1, 3 / 7-3 / 7 = 0, 1 + 0 = 0 is to apply the additive commutative law to calculate those with the same denominator

RELATED INFORMATIONS

1. Calculate the following questions. If you can simplify the calculation, please simplify the calculation. There is only one question that can be simplified. I didn't list that question, but these three questions are not simplified 1 (3 / 4 plus 1 / 3) divided by 9 / 8 x 3 / 26 2 (75% plus 2 / 7 minus 9 / 14) divided by 1 / 28 3 5.48 minus 4 out of 9 minus 10 out of 99 divided by 2 out of 11
2. Calculation 1 (simple calculation to be simplified) 8.6×0.1+9.9×8.6
3. (2 ^ 9-1 * 4 * 8 * 16) ^ 5
4. 4+8+12+16+...+2004=?
5. (2+1)(2²+1)(2^4+1)(2^8+1)(2^16+1)(2^32+1)+1=
6. How to calculate 1.6 × 7.8 × 1.25? And 10.3 × 99 + 10.3
7. 1: 7 out of 8 = (simplification). There are other questions~ 12: 1 / 4 = (simplification) 0.2:4.8 = (simplification)
8. （1）1/2*3+1/3*4+1/4*5.1/2006*2005 （2）1/2+1/（1+1）*（2+1）+1/（1+2）*（2+2）.1/（1+2009）*（2+2009）（3）1+1/（1+2）+1/（1+2+3）+.1/（1+2+3+4.100）
9. This question: Twenty nine and eleven divided by forty-six and forty-four (I can't get the score. I can only use Chinese lowercase.)-_ -|||Make do with it.
10. What can be calculated simply should be calculated simply (1) 6 / 7 - (3 / 10-1 / 7) + 7 / 10 (2) (1 / 2 + 5 / 12 × 2 / 3) △ 7 / 9 (3) 36 × 5 / 6 + 5 / 6 × 0.64 (4) 5x of 6 + 1 of 6 = 8 of 9 （5）0.69+0.53+2.47+0.31
11. 42:11 × 3 and 2:1 × 1 and 5:1 =? 2 / 3 △ 5 / 18 × 3 / 8 =? Calculate each problem, can calculate simply want to calculate simply
12. Calculate the next question, can be simple to calculate 1 / 5 + 1 / 3 + 2 / 15 + 7 / 12 19.59-32.48÷16+12×1.02 2 / 7 × [(5 / 9 + 8 / 27) × 2 / 3] [denotes brackets,
13. （1）(1000×70%-100×70%)×1/9 （2）80%×3/4-20%×0.5 （3）10÷25＋1/2×3/10 （4）（7/12-1/4）÷1/2+1/3 （5）6/11÷（40%×7/11)+6/7 （6）3/5×6/7+20%×3/7 No simple calculation, no simple calculation
14. How can this problem be simplified 197×97/98+1/98 How can we make a simple calculation,
15. Help me with a few simple problems 1.25×0.79×16 15.7-12.6×0.3 0.571×0.1-0.57×0.1 4.6×0.75+0.46×2.5 48×0.25
16. How to simplify these questions? 1.99.9X7+11.1X37 2.4.2X4.2+0.42X58 3.1.25X(8+0.8+0.8)
17. 276÷{32-[306÷（201×47-9413）]}=______ ．
18. Simple mathematical calculation 50 questions, one formula includes multiplication, division, addition or subtraction, Speed up! Six years·
19. Mathematical problem off form calculation 4-[3.75×（1.2-1/3）+3/4]
20. What can be calculated simply must be calculated simply, and what cannot be calculated simply can not be calculated simply 1.5/7÷5/12×（7/12-5/12）+5/7 2.3 / 16 × 1 and 7 / 9 + 1 / 2 × 7 / 13 + 6 / 13 × 0.5 3.（4/5-1/3）÷（7/8+7/10×5/12） 4.4/9÷〖4/5-（1/5+1/3）〗 5.2 and 2 / 3 × 4 / 5 + 0.8 × 1 and 1 / 3 + 6 × 80 ‰ 6.15/16+(7/16-1/4)÷1/2 7.1/3÷（2/3-2/5）×3/5 8.8/9+8/9+8/9+8/9+5/9 9.〖1/2-（3/4-3/5）〗÷7/10 10.（3/5-2/5×3/4）÷1/5+0.5 100 points for satisfaction Make it clear