bài 5 nha
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Bài 4: Ngày 27
Bài 5: Nếu thêm vào 2kg nữa thì sẽ có 3 x 6 = 18kg gạo
Vậy số gạo đó nặng 18 - 2 = 16 kg
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5:
a: Xét ΔCBA vuông tại A và ΔCAH vuông tại H có
góc C chung
=>ΔCBA đồng dạg với ΔCAH
=>CB/CA=CA/CH
=>CA^2=CB*CH
b: HB=6^2/8=4,5cm
=>BC=8+4,5=12,5cm
Xét ΔHAC có HK là phân giác
nên AK/HA=CK/CH
=>AK/3=CK/4=(AK+CK)/(3+7)=10/7
=>AK=30/7cm; CK=40/7cm
Bài 1:
a) \(1-\dfrac{1}{2}+\dfrac{1}{3}=\dfrac{6}{6}-\dfrac{3}{6}+\dfrac{2}{6}=\dfrac{5}{6}\)
b) \(\dfrac{2}{5}+\dfrac{3}{5}:\dfrac{9}{10}=\dfrac{2}{5}+\dfrac{3}{5}\cdot\dfrac{10}{9}=\dfrac{2}{5}+\dfrac{2}{3}=\dfrac{16}{15}\)
Bài 1:
c) \(\dfrac{7}{11}\cdot\dfrac{3}{4}+\dfrac{7}{11}\cdot\dfrac{1}{4}+\dfrac{4}{11}=\dfrac{7}{11}\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\dfrac{4}{11}=\dfrac{7}{11}+\dfrac{4}{11}=1\)
d) \(\left(\dfrac{3}{4}+0.5+25\%\right)\cdot2\dfrac{2}{3}=\dfrac{3}{2}\cdot\dfrac{8}{3}=4\)
take the doctor's advice
keep the children away from this medicine
have a medical check every month
be in a lot of pain
have an appointment with the dentist
fill the cavity get sunburnt after the holiday avoid obesity
stay in shape put on / lose weight perform a surgery
Bài 5:
a) \(\sqrt{\left(\sqrt{3}-\sqrt{2}\right)^2}-\sqrt{\left(\sqrt{3}+\sqrt{2}\right)^2}=\sqrt{3}-\sqrt{2}-\sqrt{3}-\sqrt{2}=-2\sqrt{2}\)
b) \(\sqrt{\left(\sqrt{2}+1\right)^2}-\sqrt{\left(\sqrt{2}-1\right)^2}=\sqrt{2}+1-\sqrt{2}+1=2\)
c) \(\sqrt{\left(1-\sqrt{2}\right)^2}-\sqrt{\left(\sqrt{2}-3\right)^2}=\sqrt{2}-1-3+\sqrt{2}=-4+\sqrt{2}\)
1 He playes tennis every Monday evening
He doesn't play tennis every Monday evening
Does he play tennis every Monday evening?
2 Her father watches TV every day
Her father doesn't watch TV every day
Does her father watch TV every day?
3 ??
4 My brother and I are students
My brother and I aren't students
Are my brother and I students?