BAI 2 CHUNG TO
1, (a -b +c) - (a+c ) =-b
2, (a + b ) -( b-a0 + c =2a+c
3, -(a+b -c) + (a-b-c )=-2b
4,a nhan ( b+ c) -a nhan (b+d) =a (c-d)
5,a nhan (b -c) =a (d +c )= a nhan ( b +d)
Những câu hỏi liên quan
Rút gọn biểu thức
(a-b+c-d)-(a+b+c+d)
(-a+b-c)+(a-b)-(a-b+c)
-(a-b-c)+(b-c+d)-(a+b+d)
Tìm số nguyên x,biết
x+x+x+82=-2-x
5 nhan (-40) nhan x=-100
(-1) nhan (-3) nhan (-6) nhan x=36
gia tri tuyet doi cua
1-4x=7
x nhan(x-2)=0
x nhan(x-2) lon hon 0
(a-b+c-d)-9a+b+c+d)=a-b+c-d-a-b-c-d
=(a-a)-(b+b)+(c-c)-(d-d)
=0-2b+0-2d
=-2b-2d
(-a+b-c)+(a-b)-(a-b+c)
=-a+b-c+a-b-a+b-c
=(-a+a-a)+(b-b+b)-(c+c)
=-a+b-2c
-(a-b-c)+(b-c+d)-(a+b+d)
=-a+b+c+c-c+d-a-b-d
=(-a-a)+(b-b)+(c+c-c)+(d-d)
=-2a+0+c+0
=-2a+c
x+x+x+82=-2-x
3x+82=-2-x
3x+x=-2-82
4x=-84
x=-84:4=-21
5.(-40).x=-100
-200.x=-100
x=-100:(-200)
x=0,5
-1.(-3).(-6).x=36
-18.x=36
x=36:(-18)
x=-2
|1-4x|=7
Xảy ra hai trường hợp:1-4x=7=>4x=1-7=-6=>x=-6:4=-1,5
1-4x=-7=>4x=1+7=8=>x=8:4=2
Vì x là số nguyên nên ta chỉ có một đáp án đó là:2
x.(x-2)=0+> x=0 hoặc x=2
x.(x-2)>0=>x=-1;-2;-3;-4;...
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cho 2 nhan (a+b+c)=a nhan b+b nhan c+a nhan c=12
tinhM=(a-b)^2014 +(b-a)^2015 +(c-a)^2015
Tìm số a b c d e biet a b c d e nhan 9 bằng e d c b a
Ta có :
abcde x 9 =edcba
Suy ra a=1 vì a>1 thì được kết quả gồm 6 chữ số.
a=1 mà e.9=..a suy ra e=9
b.9=d suy ra b=o
Hoặc b=1 và không có dư từ phép nhân trước.
Nếu b=0 ta có 10cd9 x9=9dc01
d9 x 9=c01 suy ra d=8
10c89 x 9=98c01
0c89 x 9 =8c01 suy ra c =9
Vậy số cần tìm là 10989
nhé !
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tim cac chu so a,b,c,d biet a nhan bcd nhan abc = abcabc
1 a, 3 va 1/5 - 2 va 1/6 + 1/5b, 5 va 12/13 - 2 va 15/26 + 1/26c, 7 va 1/12 + 1/12 - 6 va 1/4 2 tinh gia tri bieu thuc a, 3 va 2/9 - [1 va 5/8 + 1 va 2/9 ] - 3/8b, 4 va 2/5 - 1 va 3/7 - 1 va 4/7 + 1/5c, 1 va 9/12 - 5/4 - 1/23 tinh a, 6 nhan 7 nhan 8 nhan 9 nhan 1 tren 18 nhan 16 nhan 14 nhan 12 nhan 2b, 4 nhan 15 nhan 9 nhan 24 tren 3 nhan 12 nhan 8 nhan 5 4 rut gon cac phan so a, 96/150 ; 255/408 ; 630/224b, 1515/1717; 352352/470470; 200620062006/2005200520055 so sanh cac phan so a,...
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1 a, 3 va 1/5 - 2 va 1/6 + 1/5
b, 5 va 12/13 - 2 va 15/26 + 1/26
c, 7 va 1/12 + 1/12 - 6 va 1/4
2 tinh gia tri bieu thuc
a, 3 va 2/9 - [1 va 5/8 + 1 va 2/9 ] - 3/8
b, 4 va 2/5 - 1 va 3/7 - 1 va 4/7 + 1/5
c, 1 va 9/12 - 5/4 - 1/2
3 tinh
a, 6 nhan 7 nhan 8 nhan 9 nhan 1 tren 18 nhan 16 nhan 14 nhan 12 nhan 2
b, 4 nhan 15 nhan 9 nhan 24 tren 3 nhan 12 nhan 8 nhan 5
4 rut gon cac phan so
a, 96/150 ; 255/408 ; 630/224
b, 1515/1717; 352352/470470; 200620062006/200520052005
5 so sanh cac phan so
a, 7/9 va 9/7 ; b, 135/120 va 13/8; c, 3535/4848 va 5/8 ; d, 650650/480480 va 222222/144144
6, so sanh hai phan so
a, 2005/2006 va 2006/2007 ; b, 2008/2007 va 2007/2006
cac ban lam tung buoc nha
BAI 1 viet duoi dang tich cua cac tong sau
1,ab+ac
2, ab- ac +a
3, ax - bx -cx +dx
4,a nhan (b+c ) -d (b +c)
5, ac _ ad + bc - bd
6, ax +by +bx+ay
\(ab+ac=a\left(b+c\right)\)
\(ab-ac+a=a\left(b-c+1\right)\)
\(ax-bx-cx+dx=x\left(a-b-c-d\right)\)
\(a\left(b+c\right)-d\left(b+c\right)=0\Leftrightarrow\left(b+c\right)\left(a-d\right)\)
\(ac-ad+bc-bd=a\left(c-d\right)+b\left(c-d\right)=\left(a+b\right)\left(c-d\right)\)
\(ax+by+bx+ay=\left(ax+ay\right)+\left(bx+by\right)=a\left(x+y\right)+b\left(x+y\right)=\left(a+b\right)\left(x+y\right)\)
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ab + ac = a( b + c )
ab - ac + a = a( b - c +1 )
ax - bx - cx + dx = x( a - b - c - d )
a( b + c ) - d( b + c ) = 0 <=> ( b + c ) ( a - d )
ac - ad + bc - bd = a( c - d ) + b( c - d ) = ( a + b ) ( c - d )
ax + by + bx + ay = ( ax + ay ) + ( bx + by ) = a( x + y ) + b( x + y ) = ( a + b ) ( x + y )
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1, ab + ac = a . ( b + c )
2, ab - ac + a = a . ( b - c + 1)
3, ax - bx - cx + dx = x . ( a - b - c + d )
4, a . ( b + c ) - d . ( b + c) = ( a - d ) . ( b + c )
5, ac - ad + bc - bd = a . ( c - d ) + b . ( c - d ) = ( a + b ) . ( c - d )
6, C1: ax + by + bx + ay = ( ax + ay ) + ( bx + by ) = a . ( x + y ) + b . ( x + y ) = ( a + b ) . ( x + y)
C2: ax + by + bx + ay = ( ax + bx ) + ( ay + by ) = x . ( a + b ) + y . ( a + b ) = ( x + y ) . (a + b )
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Choose the best answer A, B, C or D. 1. The Temple of Literature ………………… by thousands of people every year. A. is visit B. is visited C. was visited D. were visited 2. Emperor Ly Nhan Tong is the person who constructed ………………… A. The Imperial Academy B. Great Wall C. One-pillar Pagoda D. Ha Long Bay 3. Doctors’ stone tablets were made of ………………… A. sand B. brick ...
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Choose the best answer A, B, C or D.
1. The Temple of Literature ………………… by thousands of people every year.
A. is visit B. is visited C. was visited D. were visited
2. Emperor Ly Nhan Tong is the person who constructed …………………
A. The Imperial Academy B. Great Wall
C. One-pillar Pagoda D. Ha Long Bay
3. Doctors’ stone tablets were made of …………………
A. sand B. brick C. stone D. cement
4. The Temple of Literature is one of the historic and ………… sites in Viet Nam.
A. cultural B. culture C. old D. new
5. It’s a great idea to take some medicines ………………… you have a fever now.
A. so B. because C. but D. and
6. There is a pond ………………… the garden and the house.
A. in B. among C. between D. on
7. You’d better ………………… an umbrella because it is going to rain.
A. to take B. taking C. take D. took
8. ThienQuang well was ………………… as a world heritage.
A. met B. recognized C. seen D. watched
9. The Imperial Academy was regarded ………… the first university in Viet Nam.
A. to B. for C. as D. with
10. The Imperial Academy was ………… in 1076 under Emperor Ly Nhan Tong.
A. construct B. construction C. constructing D. constructed
11. Stone tablets were erected on the ………………… of the tortoise after each Royal examination.
A. back B. stomach C. head D. arm
12. The ………………… of this pagoda lasted 2 years.
A. instruct B. instruction C. instructing D. instructed.
Choose the best answer A, B, C or D.
1. The Temple of Literature ………………… by thousands of people every year.
A. is visit B. is visited C. was visited D. were visited
2. Emperor Ly Nhan Tong is the person who constructed …………………
A. The Imperial Academy B. Great Wall
C. One-pillar Pagoda D. Ha Long Bay
3. Doctors’ stone tablets were made of …………………
A. sand B. brick C. stone D. cement
4. The Temple of Literature is one of the historic and ………… sites in Viet Nam.
A. cultural B. culture C. old D. new
5. It’s a great idea to take some medicines ………………… you have a fever now.
A. so B. because C. but D. and
6. There is a pond ………………… the garden and the house.
A. in B. among C. between D. on
7. You’d better ………………… an umbrella because it is going to rain.
A. to take B. taking C. take D. took
8. ThienQuang well was ………………… as a world heritage.
A. met B. recognized C. seen D. watched
9. The Imperial Academy was regarded ………… the first university in Viet Nam.
A. to B. for C. as D. with
10. The Imperial Academy was ………… in 1076 under Emperor Ly Nhan Tong.
A. construct B. construction C. constructing D. constructed
11. Stone tablets were erected on the ………………… of the tortoise after each Royal examination.
A. back B. stomach C. head D. arm
12. The ………………… of this pagoda lasted 2 years.
A. instruct B. instruction C. instructing D. instructed.
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Phan tich da thuc sau thanh nhan tu:
a) \(a\left(b+c\right)^2+b\left(c+a\right)^2+c\left(a+b\right)^2\)
b)\(a^4+b^4+c^4-2a^2b^2-2a^2c^2-2c^2b^2\)
Tinh nhanh:
a)12,5 nhan 40,7 +59,3 nhan 12,5
b)38,6 nhan 0,05 - 38,6 nhan 0,04
c)12 : 1,25 : 0,08
d) (82,6 nhan 4,5 ) : 41,3
a) 12,5 * 40,7 + 59,3 * 12,5
= ( 40,7 + 59,3 ) * 12,5
= 100 * 12,5
= 1250
b) 38,6 * 0,05 - 38,6 - 0,04
= 38,6 * ( 0,05 - 0,04 )
= 38,6 * 0,01
= 0,386
c) 12 : 1,25 : 0,08
= 12 : ( 1,25 * 0,08 )
= 12 : 0,1
= 120
d) ( 82,6 * 4,5 ) : 41,3
= 41,3 * ( 2 * 4,5 ) : 41,3
= 41,3 * 9 : 41,3
= 41,3 : 41,3 * 9
= 9
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