đúng mik tick nhe
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\(\left(123\text{ ×}0,25+123\text{ ×}0,75\right)\text{ ×}\left(11\text{ ×}9-900\text{ ×}0,1-9\right)\)
\(=\left(123\text{×}0,25+123\text{×}0,75\right)\text{ ×}\left(11\text{×}9-9\text{×}100\text{×}0,1-9\text{×}1\right)\)
\(=\left(123\text{×}0,25+123\text{×}0,75\right)\text{ ×}\left(11\text{×}9-9\text{×}10-9\text{×}1\right)\)
\(=\left[123\left(0,25+0,75\right)\right]\text{×}\left[9\text{×}\left(11-10-1\right)\right]\)
\(=\left(123\text{×}1\right)\text{×}\left(9\text{×}0\right)=123\text{×}0=0\)
1A ; 2B ; 3A ; 4B ; 5B ; 6B ; 7A ; 8B
; 9A ; 10A ; 11A ; 12B ; 13B ; 14B ; 15B
1. A . is riding
2. B. are doing .
3. A. is plaing
4. B. are cycling
5. B. are sunbathing
6. B. are not swimming
7. A. is swimming
8. B. is not listening
9.A. is playing
10. A. is doing
11. B. Does
12. B. are sitting .
13. B. are watching
14. B. is driving
15. B. is carrying
34×x-25×x+x×1=8600
(34-25+1)×x =8600
10×x=8600
X=8600÷10
X=860
34.x+25.x+1.x=8600
x.(34+25+1) = 8600
x.100 = 8600
x = 8600:100
x = 86
1. plays
2. buys
3. studies
4. tries
5. enjoys
6. washes
7. cries
8. says
9. doesn't get up
10. flies
1. plays
2. buys
3. studies
4. tries
5. enjoys
6. washes
7. cries
8. says
9. doesn't get up
10. flies