9 + 34 = ?
34 + 9 = ?
9-4+1+234-34+234-34+234-34+234-34+234-34-6
9-4+1+234-34+234-34+234-34+234-34+234-34-6
=1000
tick nha!
(1/4 + 11/9) : 34/5 + (-2/9 + 29/4) : 34/5
Giải:
\(\left(\dfrac{1}{4}+\dfrac{11}{9}\right):\dfrac{34}{5}+\left(\dfrac{-2}{9}+\dfrac{29}{4}\right):\dfrac{34}{5}\)
\(=\left(\dfrac{1}{4}+\dfrac{11}{9}\right).\dfrac{5}{34}+\left(\dfrac{-2}{9}+\dfrac{29}{4}\right).\dfrac{5}{34}\)
\(=\left[\left(\dfrac{1}{4}+\dfrac{11}{9}\right)+\left(\dfrac{-2}{9}+\dfrac{29}{4}\right)\right].\dfrac{5}{34}\)
\(=\left[\dfrac{1}{4}+\dfrac{11}{9}-\dfrac{2}{9}+\dfrac{29}{4}\right].\dfrac{5}{34}\)
\(=\left[\dfrac{9}{9}+\dfrac{30}{4}\right].\dfrac{5}{34}\)
\(=\left[1+\dfrac{15}{2}\right].\dfrac{5}{34}\)
\(=\dfrac{17}{2}.\dfrac{5}{34}\)
\(=\dfrac{5}{4}\)
Vậy ...
Khoảng thời gian từ lúc 9 giờ kém 10 phút đến 9 giờ 30 phút là
tính nhanh: 34 x 9 + 34 - 10 x14
Tìm số nguyên x biết 34 - (25 + 34) = x - (25 - 9)
A. 10
B. – 10
C. 9
D. – 9
Đáp án là D
34 - (25 + 34) = x - (25 - 9)
34 - 25 - 34 = x - 16
34 - 34 - 25 = x - 16
-25 = x - 16
-25 + 16 = x
-(25 - 16) = x
-9 = x
`15/34+7/21+9/34-1 15/17+2/3`
`=(15/34+9/34)+(7/21+2/3)-32/17`
`=12/17+1-32/17`
`=(12/17-32/17)+1`
`=-20/17+1`
`=-3/17`
\(\dfrac{15}{34}+\dfrac{7}{21}+\dfrac{9}{34}-1\dfrac{15}{17}+\dfrac{2}{3}\)
\(=\left(\dfrac{15}{34}+\dfrac{9}{34}-\dfrac{32}{17}\right)+\left(\dfrac{1}{3}+\dfrac{2}{3}\right)\)
\(=-\dfrac{25}{17}+1=-\dfrac{8}{17}\)
Đang cần gấp
Bài 7. Tính nhanh giá trị biểu thức: 34 × 12 + 34 × 7 – 34 × 9:
C. 2400
D. 3210
B. 3400
A. 340
15/34+7/21+9/34-32/17+2/3
ap dung nhan chia truoc cong tru sau
A = 15/34 + 7/21 + 9/34 - 1l15/17 + 2/3
Sửa đề:
\(A=\dfrac{15}{34}+\dfrac{7}{21}+\dfrac{9}{34}-1\dfrac{15}{17}+\dfrac{2}{3}\)
\(=\dfrac{15}{34}+\dfrac{7}{21}+\dfrac{9}{34}-\dfrac{32}{17}+\dfrac{2}{3}\)
\(=-\dfrac{3}{17}\)