Lm giùm mình 2 bài này nha
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LV
1
TG
2
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LM
28 tháng 6 2021
a): ta có AB^2 + AC^2 = 30^2 = 900 <=> AB = √(900 - AC^2)
AB:AC = 3:4 <=> AB = 3 * AC / 4
=> √(900 - AC^2) = 3 * AC / 4
<=> 900 - AC^2 = 9 * AC^2 / 16
<=> 14400 - 16 * AC^2 = 9 * AC^2
<=> 14400 = 25 * AC^2
<=> 576 = AC^2
<=> AC = 24
=> AB = 24 / 4 * 3 = 18
NK
0
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II _
1 _ f
2 _ a
3 _ g
4 _ d
5 _ b
6 _ h
7 _ e
8 _ c
III _
1 _ When it's cold , they play soccer
2 _ When it's hot , the students go swimming
3 _ When it's cool , she goes jogging
XI _
1 . Do they always go fishing with their parents on the weekend ?
2 . Does Lan play badminton every day ?
3 . She is doing aerobics now
4 . How often do the children go to the movies
5 . Nam often plays video games in the afternoon
6 . The students sometimes have a picnic
7 . Do they sometimes go camping ?
8 . He usually goes swimming with his friends