Tính nhanh :
3491 - 5392 + 6619
K
Khách
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Những câu hỏi liên quan
20 tháng 5 2016
\(\frac{5392+6001x5931}{6381x6001-69}=\frac{35597323}{3829312}\)
20 tháng 5 2016
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CC
2
27 tháng 2 2016
các bạn lưu ý đây là phân số
dấu gạch ngang là phân số đó
AH
Akai Haruma
Giáo viên
4 tháng 3 2023
Bạn xem lại xem viết đúng đề chưa vậy. Bài toán không phù hợp với lớp tiểu học.
28 tháng 6 2017
Bài làm ( Lưu ý : dấu . là dấu x )
a ) \(\frac{1997\cdot1996-1}{1995\cdot1997+1996}\) b ) \(\frac{254\cdot399-145}{254+399\cdot253}\)
\(=\frac{1997\cdot\left(1995+1\right)-1}{1995\cdot1997+1996}\) \(=\frac{\left(253+1\right)\cdot399-145}{399\cdot253+254}\)
\(=\frac{1997\cdot1995+1997\cdot1-1}{1995\cdot1997+1996}\) \(=\frac{253\cdot399+399\cdot1-145}{253\cdot399+254}\)
\(=\frac{1997\cdot1995+1996}{1995\cdot1997+1996}\) \(=\frac{253\cdot399+254}{253\cdot399+254}\)
\(=1\) \(=1\)
c ) \(\frac{1997\cdot1996-995}{1995\cdot1997+1002}\) d ) \(\frac{5932+6001\cdot6391}{5392\cdot6001-69}\)
\(=\frac{1997\cdot\left(1995+1\right)-995}{1995\cdot1997+1002}\) \(=\frac{6001\cdot5391+5932}{5391\cdot6001-69}\)
\(=\frac{1997\cdot1995+1997\cdot1-995}{1995\cdot1997+1002}\) \(=\frac{6001\cdot5391+5932}{\left(5931+1\right)\cdot6001-69}\)
\(=\frac{1997\cdot1995+1002}{1995\cdot1997+1002}\) \(=\frac{6001\cdot5931+5932}{5931\cdot6001+6001\cdot1-69}\)
\(=1\) \(=\frac{6001\cdot5391+5932}{5391\cdot6001+5932}\)
\(=1\)
d ) \(\frac{1996\cdot1995-996}{1000+1996\cdot1994}\)
\(=\frac{1996\cdot1995-996}{1996\cdot1994+1000}\)
\(=\frac{1996+\left(1994+1\right)-996}{1996\cdot1994+1000}\)
\(=\frac{1996\cdot1994+1996\cdot1-996}{1996\cdot1994+1000}\)
\(=\frac{1996\cdot1994+1000}{1996\cdot1994+1000}\)
\(=1\)
14 tháng 4 2017
bài 2: bài giải
dãy số trên là dãy số cách đều có khoảng cách giữa hai số liền kề là 1,5
vậy khoảng cách của hai số liền kề là 1,5
dãy số trên có số số hạng là:
(17,75 - 1,25) : 1,5 +1 = 12 (số hạng)
tổng trên là:
(17,75 + 1,25) x 12 :2 = 114
đáp số: 114
LQ
28 tháng 9 2019
1,\(\frac{1995.1994-1}{1993.1995+1994}=\frac{1995.\left(1993+1\right)-1}{1993.1995+1994}\)
=\(\frac{1995.1993+1995-1}{1993.1995+1994}=\frac{1995.1993+1994}{1993.1995+1994}=1\)
21 tháng 7 2023
Sửa đề: 8666
8666*15+170*4333
=4333*(2*15+170)
=200*4333
=866600
DH
2
16 tháng 2 2021
A = 44 . 82 -22 + 18 . 44
= 44 . 82 - 4 + 18 . 44
= 44. ( 82 + 18 ) - 4
= 44 . 100 - 4
= 4400 - 4
= 4396
16 tháng 2 2021
Ta có: \(A=44\cdot82-2^2+18\cdot44\)
\(=44\cdot\left(82+18\right)-4\)
\(=44\cdot100-4\)
\(=4400-4=4396\)
= 4718