324x36-254x72+18x368
7364-(8475-4555)-364+445+475
21x32x43-21x32x40-21x32x3
giúp mik với ạ mik cần gấp ak
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1 Lan goes to the supermarket on foot
2 Our garden has many flowers
3 He has black hair
4 We don't have to finish the task today (not necessary => don't have to: không cần làm gì, còn must not là không được làm gì nên câu này đề cho must là sai)
5 Are there 23 students in your class?
6 Lan is not as young as Minh
a: Xét tứ giác AKBD có
I là trung điểm của AB
I là trung điểm của DK
Do đó: AKBD là hình bình hành
mà \(\widehat{ADB}=90^0\)
nên AKBD là hình chữ nhật
b: Xét tứ giác AKDC có
AK//DC
AK=DC
Do đó: AKDC là hình bình hành
Suy ra: KD//AC; KD=AC
1 were - would you play
2 weren't studying - would have
3 had taken - wouldn't have got
4 would you go - could
5 will you give - is
6 recycle - won't be
7 had heard - wouldn't have gone
8 would you buy - had
9 don't hurry - will miss
10 had phoned - would have given
11 were - wouldn't eat
12 will go - rains
13 had known - would have sent
14 won't feel - swims
15 hadn't freezed - would have gone
\(324\cdot36-254\cdot72+18\cdot368\)
\(=18\cdot\left(324\cdot2-254\cdot3+368\right)\)
\(=18\cdot\left(648-1016+368\right)\)
\(=18\cdot\left(1016-1016\right)\)
\(=18\cdot0\)
\(=0\)
\(7364-\left(8475-4555\right)-364+445+475\)
\(=7364-8475+4555-364+445+475\)
\(=\left(7364-364\right)-\left(8475-475\right)+\left(4555+445\right)\)
\(=7000-8000+5000\)
\(=4000\)
\(21\cdot32\cdot43-21\cdot32\cdot40-21\cdot32\cdot3\)
\(=21\cdot32\cdot\left(43-40-3\right)\)
\(=21\cdot32\cdot0\)
\(=21\cdot0\)
\(=0\)