Tính nhanh
2/3 : 5/7 x 5/7 : 2/3 + 1934
tính nhanh :
`2/3:5/7xx5/7:2/3+1934`
`2/3:5/7xx5/5:2/3+1934`
`=2/3xx7/5xx5/7xx3/2+1934`
`=[2xx7xx5xx3]/[3xx5xx7xx2]+1934`
`=1+1934=1935`
2/3 : 5/7 x 5/7 :2/3 +1934
= (2/3 : 2/3)x(5/7 : 5/7) +1934
= 1x1+1934
= 1 +1934
= 1935
tính nhanh
a] 3/5 . 1195/1999 +4/1999 . 3/5
b] 2/3 : 5/7 . 5/7 : 2/3 + 1934
c] 7/8 :5 +7/8 .5 -2 .7.8
d] 3 1/11 .27/46.16/11. 24.9
a.\(\frac{3}{5}\)\(.\)\(\frac{1195}{1999}\)+ \(\frac{4}{1999}\)\(.\)\(\frac{3}{5}\)= \(\frac{3}{5}.\left(\frac{1195}{1999}+\frac{4}{1999}\right)\)= \(\frac{3}{5}.1\)= \(\frac{3}{5}\)
b. \(\frac{2}{3}\)\(:\)\(\frac{5}{7}\)\(.\)\(\frac{5}{7}\)\(:\)\(\frac{2}{3}\)\(+1934\)= \(\frac{2}{3}\).\(.\)\(\frac{7}{5}\)\(.\)\(\frac{5}{7}\)\(.\)\(\frac{3}{2}\)\(+\)\(1934\)= \(1\)\(+\)\(1934\)= \(1935\)
a] 3/5 . (1195/1999+4/1999)=tự tính
b] (2/3:2/3) . (5/7:5/7) + 1934=tự tính
Sr nha, mình bt làm hai câu đầu thôi.
tính nhanh
a)\(\frac{2}{3}:\frac{5}{7}\cdot\frac{5}{7}:\frac{2}{3}+1934\)
b) \(\frac{1}{5}:\frac{1}{3}\cdot\frac{1:3}{1:5}+1996\)
b) \(\frac{1}{5}:\frac{1}{3}\cdot\frac{\frac{1}{3}}{\frac{1}{5}}+1996\)
\(=\frac{3}{5}\cdot\left(\frac{1}{3}:\frac{1}{5}\right)+1996\)
\(=\frac{3}{5}\cdot\frac{5}{3}+1996\)
\(=1+1996=1997\)
a) \(\frac{2}{3}:\frac{5}{7}\cdot\frac{5}{7}\cdot\frac{2}{3}+1934\)
\(=\frac{2\cdot7}{5\cdot3}\cdot\frac{5\cdot2}{7\cdot3}+1934\)
\(=\frac{2\cdot7\cdot5\cdot2}{5\cdot3\cdot7\cdot3}+1996=\frac{4}{9}+1996\)
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Bài 7 :Tính nhanh:
a) 2/3:5/7x5/7:2/3+1934
b) (30 : \(7\frac{1}{2}\)+0,5 x 3 -1,5 ) x (\(4\frac{1}{2}-\frac{9}{2}\)) : ( 14,5 x 1000 )
c) (1999 x 1998 + 1998 x 1997 ) x ( 1 + 1/2 : 1\(\frac{1}{2}\)-1\(\frac{1}{3}\))
b) \(\frac{1}{1000}+\frac{13}{1000}+\frac{25}{1000}+...+\frac{87}{1000}+\frac{99}{1000}\)
\(=\frac{1+13+25+...+85+97}{1000}=\frac{\left(97+1\right).\left[\left(97-1\right):12+1\right]:2}{1000}\)
\(=\frac{49.9}{1000}=\frac{441}{1000}.\) ( Đề bài sai nhé bạn tử số : 1; 13; 25; 37; 49 ; 61; 73; 85 ; 97. )
Tính nhanh 1/5 :1/3 x 1:5/1:3 + 1934
Bài 7 :Tính nhanh:
a) 2/3:5/7x5/7:2/3+1934
b) (30 : 7\(\frac{1}{2}\) +0,5 x 3 -1,5 ) x (4\(\frac{1}{2}\)−\(\frac{9}{2}\)) : ( 14,5 x 1000 )
c) (1999 x 1998 + 1998 x 1997 ) x ( 1 + 1/2 : 1\(\frac{1}{2}\) -1\(\frac{1}{3}\) )
#)Trả lời :
\(a,\frac{2}{3}:\frac{5}{7}.\frac{5}{7}:\frac{2}{3}+1934\)
\(=\left(\frac{2}{3}:\frac{2}{3}\right).\left(\frac{5}{7}:\frac{5}{7}\right)+1934\)
\(=1.1+1934\)
\(=1935\)
#~Will~be~Pens~#
Trả lời :
\(a,\text{ }\frac{2}{3}\text{ : }\frac{5}{7}\text{ x }\frac{5}{7}\text{ : }\frac{2}{3}+1934\)
\(=\left(\frac{2}{3}\text{ : }\frac{2}{3}\right)\text{ x }\left(\frac{5}{7}\text{ : }\frac{5}{7}\right)+1934\)
\(=1\text{ x }1+1934\)
\(=1935\)
#)Next :
\(\left(30:7\frac{1}{2}+0,5.3-1,5\right)\left(4\frac{1}{2}-\frac{9}{2}\right):\left(14,5.1000\right)\)
\(=\left(30:7\frac{1}{2}+0,5.3-1,5\right)\left(\frac{9}{2}-\frac{9}{2}\right):\left(14,5.1000\right)\)
\(=\left(30:7\frac{1}{2}+0,5.3-1,5\right).0:\left(14,5.1000\right)\)
\(=0\)
2. Tính nhanh: A) 4/5 : 3/7 × 3/7 : 4/5 + 2011. B) 1/2 x 2/3 : 7/9 x 7/9.
a: \(=\dfrac{4}{5}\cdot\dfrac{7}{3}\cdot\dfrac{3}{7}\cdot\dfrac{5}{4}+2011=2011+1=2012\)
b: \(=\dfrac{1}{3}\cdot\dfrac{9}{7}\cdot\dfrac{7}{9}=\dfrac{1}{3}\)
`a)4/5:3/7xx3/7:4/5+2011`
`=4/5xx7/3xx3/7xx5/4+2011`
`=(4/5xx5/4)xx(7/3xx3/7)+2011`
`=1xx1+2011`
`=1+2011`
`=2012`
__
`b)1/2xx2/3:7/9xx7/9`
`=1/2xx2/3xx9/7xx7/9`
`=(1/2xx2/3)xx(9/7xx7/9)`
`=1/3xx1`
`=1/3`
Tính 9/5 + 3/4 4/7 x 3/8 6/7 x 2/3 - 2/7 3/5 - 2/9 5/9 ÷ 5/6 4/5 ÷2/5 x 1/4
Nhanh giúp mik nhá
= 51/20
----------------------------------
= 3/14
------------------------------------
= 4/7 - 2/7
= 2/7
--------------------------------------
= 17/45
---------------------------------------
= 2/3
--------------------------------------
= 2 x 1/4
= 1/2
1.
a 9/5 : 3/10 + 5/3
b 7/8 x 4/5 : 3/5
2.
a, tìm X, biết
3/5 x X - 3/2 = 5/6
b, tính nhanh
12/15 + 37/7 + 16/5 + 5/7
ai làm nhanh với đũng thì mik tích hoi :D