How to calculate 20 + 3.57 × 6.72-3.57 × 7.9-6.43 × (7.9-6.72)

=20+（6.72-7.9）×3.57-6.43×（7.9-6.72）
=20-（7.9-6.72）×3.57-6.43×（7.9-6.72）
=20-（7.9-6.72）×（3.57+6.43）
=20-1.18×10=20-11.8=8.2

RELATED INFORMATIONS

1. 6 5 / 18 - (4 5 / 18-0.63) simple calculation method
2. A simple method is used to calculate: 35 × 68 + 68 + 68 × 64 =
3. Simple calculation method of 96 * 68 + 48 * 64
4. 46x35 + 55x35 - 35 grade four questions, please use a simple method to calculate
5. The calculation process of 1949x (1 / 51-1 / 2000) + 51x (1 / 1949-1 / 2000) - 2000x (1 / 1949 + 1 / 51) + 3
6. 9:2000 / 2001 * 1949
7. A simple calculation of 2000 / 2000 and 2000 / 2001
8. 9:2000 / 2001 × 1949 (simple calculation) 1/4÷[（1/4+11/20)×3/4+0.05]
9. (1/9×3/85)×18×51
10. 10/9×3/85×18×51=?
11. It is calculated by simple method: 57.6 × 1.6 + 28.8 × 36.8-14.4 × 80.5
12. How to calculate 56 times 125
13. Ingenious calculation of 56 + 44 × 56
14. How to solve 134 times 56 minus 134 plus 45 times 134?
15. Simple calculation: 41 × 134 / 135
16. Simple calculation of 134 × 56-134 + 45 × 134
17. 4.66 × 0.18 + 4.66 × 0.82-4.66 simple calculation of reward 10 Mother fenced a 5.8-meter-long, 4.6-meter-wide rectangular vegetable field to grow cucumbers, while father fenced a 5.2-meter-long square vegetable field to grow tomatoes. How long are the fences and how many square meters are the areas of these two vegetable fields?
18. 5.66 * 7.28-3.16 * 3.16-3.16 * 4.12,
19. Disjunction calculation (can be easily used) 28.8-640% - 2.8-4.6 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 78 × 370% + 5.3 × 0.875 + 7886 × 75% + 14 △ 43932 ÷ [75% - (716-25%)] (712-37.5%) × 24-59.5%
20. Simple calculation of 8 × 4.6 + 3.5 × 8 + 4.4 × 8