Toán lớp 4 có bao nhiêu trang 🥰🥰🥰🥰🥰
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1 older
2 the biggest
3 more expensive
4 better
5 more beautiful
6 the best
7 narrower - cleaner
8 smaller
vì \(\stackrel\frown{X'OY'}\)
đối đỉnh với \(\widehat{XOY}\)
nên \(\widehat{X'OY'=70^o}\)
Viết lại bài với chính xác tương đối (không mắc lỗi nghiệm trọng)
My best friend is Thanh An. We came to the same Archimedes School, and we have been friends for 1 year. Thanh An is not short and not tall, he has a normal height. He had a short black hair and a big black eyes. He is very kind and smart, especially in Math. He is funny too, he makes me laugh even when I feel bad. I like to be friends with him. Because he is very smart at Math, we created a Zalo group to do our homework. I will tell you my secret: I sometimes copy his Math homework too (HAHAHA). I hope that I can be friends with him forever.
59 saving
60 to reward
61 haven't seen
62 to buy
63 spoke
64 stays
65 did-do
66 row
67 go
68 sets
69 will build
70 am working
71 were-doing
72 to do
74 will go
75 don't eat
76 gets
78 was visiting
79 is shining
80 Was
83 went
84 reads
91 will buy
92 takes
93 have taught
94 has lived
95 was
96 came, were playing
97 has just won
98 has already begun
99 goes
100 drinking
101 has worked
102 has
103 hasn't washed
104 drink
105 had run
106 is giving
Bài 15: Gọi diện tích thửa ruộng mà đội phải cày theo kế hoạch là x(ha)
(ĐIều kiện: x>0)
Diện tích thửa ruộng thực tế mà đội cày được là x+4(ha)
Thời gian hoàn thành dự kiến là \(\frac{x}{40}\) (ngày)
THời gian hoàn thành thực tế là \(\frac{x+4}{52}\left(ngày\right)\)
Đội hoàn thành trước dự định 2 ngày nên ta có:
\(\frac{x}{40}-\frac{x+4}{52}=2\)
=>\(\frac{13x-10\left(x+4\right)}{520}=2\)
=>13x-10(x+4)=1040
=>3x-40=1040
=>3x=1080
=>x=360(nhận)
Vậy: diện tích thửa ruộng mà đội phải cày theo kế hoạch là 360(ha)






ko bt
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