六年级的四则混合运算(要加答案的啊!!!!!!)!!!!!!

197-46+67-13=205
123-47+159-16=74
164×23-126+74=3720
117+21+17-19=136
7*9*161+93=10236
93*35-128+36=3163
86*9*187*99=14329062
42+31*180+42=5664
112*3+103*82=8782
56+7+66+1=130
109*66-29*10=6904
166-52-39+55=130
71-42+50*92=4629

3/7 × 49/9 - 4/3 =360
2. 8/9 × 15/36 + 1/27=7
3. 12× 5/6 – 2/9 ×3 =100
4. 8× 5/4 + 1/4 =8/9
5. 6÷ 3/8 – 3/8 ÷6 =10.2
6. 4/7 × 5/9 + 3/7 × 5/9=65
7. 5/2 -（ 3/2 + 4/5 ）=35.3
8. 7/8 + （ 1/8 + 1/9 =10
9. 9 × 5/6 + 5/6=4/19
10. 3/4 × 8/9 - 1/3 3900
11. 7 × 5/49 + 3/14=30
12. 6 ×（ 1/2 + 2/3 ）=175
13. 8 × 4/5 + 8 × 11/5 =945
14. 31 × 5/6 – 5/6 =0.92
15. 9/7 - （ 2/7 – 10/21 ） =5
16. 5/9 × 18 – 14 × 2/7 =10
17. 4/5 × 25/16 + 2/3 × 3/4 =33
18. 14 × 8/7 – 5/6 × 12/15=1
19. 17/32 – 3/4 × 9/24 =8
20. 3 × 2/9 + 1/3 =3/7

3/7 × 49/9 - 4/3 =360
2. 8/9 × 15/36 + 1/27=7
3. 12× 5/6 – 2