Tính nhanh giá trị biểu thức: A = ( − 5 11 + 1 2020 ) + 5 11 A=\left(\frac{-5}{11}+1^{2020}\right)+\frac{5}{11} A = ( 1 1 − 5 + 1 2 0 2 0 ) + 1 1 5

− 10 11 \frac{-10}{11} 1 1 − 1 0

− 9 11 \frac{-9}{11} 1 1 − 9

Vòi nước A chảy đầy một bể không có nước mất 3 giờ, vòi nước B chảy đầy bể đó mất 4 giờ. Hỏi trong 1 giờ, vòi A, vòi B chảy được bao nhiêu phần của bể?

V o ˋ i A : 1 3 b ể ; v o ˋ i B : 1 4 b ể Vòi\ A:\ \frac{1}{3}bể;\ vòi\ \ B:\ \frac{1}{4}bể V o ˋ i A : 3 1 b ể ; v o ˋ i B : 4 1 b ể

V o ˋ i A : 1 4 b ể ; v o ˋ i B = 1 3 b ể Vòi\ A:\frac{1}{4}bể;\ vòi\ B\ =\frac{1}{3}bể V o ˋ i A : 4 1 b ể ; v o ˋ i B = 3 1 b ể

V o ˋ i A : 3 b ể ; V o ˋ i B : 4 b ể Vòi\ A:\ 3\ bể;\ Vòi\ B:\ 4\ bể V o ˋ i A : 3 b ể ; V o ˋ i B : 4 b ể

V o ˋ i A : 4 b ể ; V o ˋ i B : 3 b ể Vòi\ A:\ 4\ bể;\ Vòi\ B:\ 3\ bể V o ˋ i A : 4 b ể ; V o ˋ i B : 3 b ể

Một khay đựng 4 quả chuối, 3 quả cam và 2 quả táo. Biết 1 quả chuối nặng 1 10 \frac{1}{10} 1 0 1 kg, một quả cam nặng 1 3 \frac{1}{3} 3 1 kg, một quả táo nặng 1 8 \frac{1}{8} 8 1 kg. Viết biểu thức tính tổng khối lượng của khay?

2 5 + 1 + 1 4 \frac{2}{5}+1+\frac{1}{4} 5 2 + 1 + 4 1

1 + 2 10 + 1 4 1+\frac{2}{10}+\frac{1}{4} 1 + 1 0 2 + 4 1

2 5 + 1 + 3 4 \frac{2}{5}+1+\frac{3}{4} 5 2 + 1 + 4 3

4 10 + 1 + 1 3 \frac{4}{10}+1+\frac{1}{3} 1 0 4 + 1 + 3 1

M = − 1 7 . 3 5 + 2 5 . − 1 7 = ? M=\frac{-1}{7}.\ \frac{3}{5}+\frac{2}{5}.\ \frac{-1}{7}=? M = 7 − 1 . 5 3 + 5 2 . 7 − 1 = ?

M = − 1 7 M=\frac{-1}{7} M = 7 − 1

M = − 2 5 M=\frac{-2}{5} M = 5 − 2

1 2 g i ờ , 4 5 g i ờ . \frac{1}{2}\ giờ\ ,\ \ \frac{4}{5}\ giờ. 2 1 g i ờ , 5 4 g i ờ . Thời gian nào dài hơn?

1 2 < 4 5 \frac{1}{2}<\frac{4}{5} 2 1 < 5 4

1 2 > 4 5 \frac{1}{2}>\frac{4}{5} 2 1 > 5 4

1 2 = 4 5 \frac{1}{2}=\frac{4}{5} 2 1 = 5 4

Phan so

Authored by Edna ._.

Mathematics

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Theo quy tắc hình 10: a=b+c. Tìm x,y=?

$x=\frac{1}{17};y=\frac{3}{17}$

$x=\frac{3}{17},y=\frac{1}{17}$

$x=\frac{1}{17};y=\frac{2}{17}$

$x=\frac{2}{17};y=\frac{1}{17}$

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