bai nay lam sao hon so nha tinh gia tri bieu thiuc 3/4 + 2 1/5 * 3 3/4 cau hai 11/4 - 2 1/5 chia 3 3/4 giup mk nha mk ko bit lam nan ni nhanh k tik cho
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Ai lam minh tik cho nha
Tinh gia tri bieu thuc sau :
B = (1-1-2)×(1-1/3)×(1-1/4)×(1-1/5)...... (1-1/2003)×(1-1/2004
bai 1 tinh nhanh
a . 1/5x6 +1/6x7+ 1/7x8 + 1/8x9 +1/9x10
b . 1/1x2 + 1/2x3 + ....... + 1/99x100
c . 2/3x5 + 2/5x7 + 2/7x8 + 2/8x9
d . 2/3x5 + 2/5x7 + .......+ 2/98x100
bai 2 tinh hop li
9/13 + 14/6 + 1/9 + 4/6 + 7/13 + 17/19
bai 3 dien dau ( , , )
a . 3/4 + 5/2 ....... 5/8 + 2 3/5 ( hon so )
B . 3 1/5 - 8/3 ......... 17/5 - 2 12/5 hon so
c . 2 4/9 + 18/7......... 22/9 + 2 4/7
giup mk nha cac ban , mai mk phai nop bai roi toi nay mk se lay y kien cua cac ban , giup mk n...
Đọc tiếp
bai 1 tinh nhanh
a . 1/5x6 +1/6x7+ 1/7x8 + 1/8x9 +1/9x10
b . 1/1x2 + 1/2x3 + ....... + 1/99x100
c . 2/3x5 + 2/5x7 + 2/7x8 + 2/8x9
d . 2/3x5 + 2/5x7 + .......+ 2/98x100
bai 2 tinh hop li
9/13 + 14/6 + 1/9 + 4/6 + 7/13 + 17/19
bai 3 dien dau ( > , < , = )
a . 3/4 + 5/2 ....... 5/8 + 2 3/5 ( hon so )
B . 3 1/5 - 8/3 ......... 17/5 - 2 12/5 hon so
c . 2 4/9 + 18/7......... 22/9 + 2 4/7
giup mk nha cac ban , mai mk phai nop bai roi 
toi nay mk se lay y kien cua cac ban , giup mk nha
b1
a) \(\dfrac{1}{5.6}+\dfrac{1}{6.7}+\dfrac{1}{7.8}+\dfrac{1}{8.9}+\dfrac{1}{9.10}\)
\(=\dfrac{1}{5}-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{8}+\dfrac{1}{8}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{10}\)
\(=\dfrac{1}{5}-\dfrac{1}{10}\)
\(=\dfrac{2}{10}-\dfrac{1}{10}\)
\(=\dfrac{1}{10}\)
b) \(\dfrac{1}{1.2}+\dfrac{1}{2.3}+...+\dfrac{1}{99.100}\)
\(=\dfrac{1}{1}-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+...+\dfrac{1}{99}-\dfrac{1}{100}\)
\(=\dfrac{1}{1}-\dfrac{1}{100}\)
\(=\dfrac{99}{100}\)
c) \(\dfrac{2}{3.5}+\dfrac{2}{5.7}+\dfrac{2}{7.9}+\dfrac{2}{9.11}\)
\(=\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{11}\)
\(=\dfrac{1}{3}-\dfrac{1}{11}\)
\(=\dfrac{8}{33}\)
d) \(\dfrac{2}{3.5}+\dfrac{2}{5.7}+...+\dfrac{2}{99.101}\)
\(=\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+...+\dfrac{1}{99}-\dfrac{1}{101}\)
\(=\dfrac{1}{3}-\dfrac{1}{101}\)
\(=\dfrac{98}{303}\)
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bai 1 :thuc hien phep tinh
a)\(\frac{-5}{2}:\left(\frac{3}{4}-\frac{1}{2}\right)\) b) \(11\frac{3}{13}-\left(2\frac{4}{7}+5\frac{3}{13}\right)\) c)\(\left(\frac{-5}{24}+0,75+\frac{7}{12}\right):\left(-2\frac{1}{4}\right)^2\)
AI LAM NHANH VA DUNG THI MK SE TICK CHO NHA
MK DAG CAN GAP !!!!!!! CAC BAN LAM NHANH LEN NHA
3/4+2 1/5* 3 3/4
11/4- 2 1/5 chia 3 3/4
giup tui tik cho ai le moi tik giup nhanh nha
3/4 + 2 =2 3/4
1/5 x 3 3/4=3/4
11/4 - 2 =3/4
1/5 : 3 3/4=4/75
TK nha
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Minh nay moi len lop 8 thui nen chua bit may ve toan lop 8 mong cac ban gai giup mk bai nay nha!!!
2x.(x-5)-x.(3+2x)=26
Lam nhanh nhat mk tick cho !!!
2x.(x - 5) - x.(3 + 2x) = 26
=> (2x2 - 10x) - (3x + 2x2) = 26
=> 2x2 - 10x - 3x - 2x2 = 26
=> -13x = 26
=> x = 26 : (-13)
=> x = -2
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2x.﴾x ‐ 5﴿ ‐ x.﴾3 + 2x﴿ = 26 => ﴾2x 2 ‐ 10x﴿ ‐ ﴾3x + 2x 2 ﴿ = 26 => 2x 2 ‐ 10x ‐ 3x ‐ 2x 2 = 26 => ‐13x = 26 => x = 26 : ﴾‐13﴿ => x = ‐2
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cau 1:tinh gia tri bieu thuc
3/4 +1/1/4 *2/2/3-(-1/2)^2:6/5
cho ma co 2 dau/la hon so,con 1 dau la phan so,con ^2 la mu 2
cau 2:tim x biet
( x-1)^5= -32
cho ^5 co nghia la mu 5
a)3/4+1/1/4*2/2/3-(-1/2)^2:6/5
=3/4+5/4*8/3-1/4:6/5
=3/4+10/3-5/24=18/24+80/24-5/24=93/24=31/8
b)(x-1)^5=32=2^5
=>x-1=2
x=2+1
x=3
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1/2*1/2+1/2*1/3+1/3*1/4+1/4*1/5+1/5*1/6
giup mk nha mai mk phải nộp rồi
ai giup mk vao toi nay mk tik cho 5 lần
Gọi biểu thức trên là \(A\). Ta có :
\(A=\frac{1}{4}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\)
\(A=\frac{1}{4}+\frac{1}{2}-\frac{1}{6}\)
\(A=\frac{3}{4}-\frac{1}{6}\)
\(A=\frac{7}{12}.\)
Đáp số : \(\frac{7}{12}.\)
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1/2x1/2+1/2x1/3+1/3x1/4+1/4x1/5+1/5x1/6
=1/4+1/2x3+1/3x4+1/4x5+1/6x6
=1/4+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1/4+1/2-1/6
=3/12+6/12-2/12
=7/12
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bai 1 tinh
a (x-2)(x^2+2x+4)-x(x^2-1)
b (x+1)(x-3)-(x+4)(x-4) lam nhanh giup em nha cam on
a) \(=x^3-8-x^3+x=x-8\)
b) \(=x^2+x-3x-3-x^2+16=13-2x\)
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tinh gia tri bieu thuc C= hon so 5 va 9 phan 10 chia 3 phan 2 - { 2 va 1 phan 3 nhan 4 va 1 phan 2 - 2 nhan 2 va 1 phan 3 } chia 7 phan 4