3+3+3+3+3+3+111=?
a) 3.( 10:x) = 111
b) 3.(10+x) =111
c) 3+( 10.x) =111
d) 3 + (10+x) = 111
Mg các bạn giúp mil, cảm ơn ạ
a)\(3.\left(10:x\right)=111\)
\(\Rightarrow10:x=37\)
\(x=10:37\)
\(x=\frac{10}{37}\)
b)\(3.\left(10+x\right)=111\)
\(\Rightarrow10+x=37\)
\(x=37-10\)
\(x=27\)
c)\(3+\left(10.x\right)=111\)
\(\Rightarrow10x=108\)
\(x=108:10\)
\(x=\frac{54}{5}\)
d)\(3+\left(10+x\right)=111\)
\(\Rightarrow10+x=108\)
\(x=108-10\)
\(x=98\)
So sánh số dư khi chia số 111...111 (81 chữ số 1 ) cho 3 và số dư khi chia tổng \(3+3^2+3^3+3^4+3^5+3^6+3^7+3^8\)cho 4
WHO HELP ME I"LL K FOR YOU
1) Cho
1/M=1/1+2+3+1/1+2+3+4+..+1/1+2+3+..+59
CMR M>2/3
2)Tính:
P=(1-1/111)(1-2/111)...(1-2009/111)
P=\(\left(1-\dfrac{1}{111}\right)\left(1-\dfrac{2}{111}\right)\times...\times\left(1-\dfrac{111}{111}\right)\times...\times\left(1-\dfrac{2009}{111}\right)\)
P=\(\left(1-\dfrac{1}{111}\right)\left(1-\dfrac{2}{111}\right)\times...\times0\times...\times\left(1-\dfrac{2009}{111}\right)\)
P=0
Tìm x, biết rằng:
a) 3.(10.x)=111
b) 3.(10+x) =111
c) 3 + (10.x) = 111
d) 3 + (10 + x) = 111
a, \(3.\left(10.x\right)=111\Leftrightarrow\left(10.x\right)=111:3\)
\(\Leftrightarrow10.x=37\Leftrightarrow x=37:10\Leftrightarrow x=3,7\)
b,\(3.\left(10+x\right)=111\Leftrightarrow\left(10+x\right)=111:3\)
\(\Leftrightarrow10+x=37\Leftrightarrow x=37-10\Leftrightarrow x=27\)
c,\(3+\left(10.x\right)=111\Leftrightarrow\left(10.x\right)=111-3\)
\(\Leftrightarrow10.x=108\Leftrightarrow x=108:10\Leftrightarrow x=10,8\)
d,\(3+\left(10+x\right)=111\Leftrightarrow\left(10+x\right)=111-3\)
\(\Leftrightarrow10+x=108\Leftrightarrow x=108-10\Leftrightarrow x=98\)
Trả lời
a)3.(10.x)=111
10.x =111:3
10.x =37
x =37:10
x =3,7
b)3.(10+x)=111
10+x =111:3
10+x=37
x =37-10
x =27
c)3+(10.x)=111
10.x =111-3
10.x =108
x =108:10
x =10,8
d)3+(10+x )=111
10+x =111-3
10+x =108
x =108-10
x =98
a, 3.(10.x)=111
10x =111:3
10x =37
x =37:10
x=3,7
a)1*2*3+2*3*4+...+111*112*113
b)1^3+2^3+3^+...+100^3
Đặt A=1.2.3+2.3.4+...+111.112.113
Ta có:4A=(1.2.3+2.3.4+...+111.112.113).4
4A=1.2.3.(4-0)+2.3.4.(5-1)+...+111.112.113.(114-110)
4A=1.2.3.4+2.3.4.5-1.2.3.4+...+111.112.113.114-110.111.112.113
4A=1.2.3.4-1.2.3.4+2.3.4.5-2.3.4.5+...+110.111.112.113-110.111.112.113+111.112.113.114
4A=111.112.113.114
=) A= 111.112.113.114/4( chia 4)
Thu gọn tổng sau C=3^100 + 3^111 + 3^112 + .........+ 3^150
Tính giá trị biểu thức sau: A=1*111+2*110+3*109+....+111*1/1+(1+2)+(1+2+3)+...+(1+2+3+....+111).
Mình cần gấp lắm các bạn giúp mình với nhé. Giải chi tiết từng bước nhá
\(A=\frac{1\times111+2\times110+3\times109+...+111\times1}{1+\left(1+2\right)+\left(1+2+3\right)+...+\left(1+2+3+...+111\right)}\)
\(A=\frac{1\times111+2\times110+3\times109+...+111\times1}{\left(1+1+...+1\right)+\left(2+2+...+2\right)+...+111}\)(\(111\)số hạng \(1\), \(110\)số hạng \(2\),...)
\(A=\frac{1\times111+2\times110+3\times109+...+111\times1}{1\times111+2\times110+3\times109+...+111\times1}\)
\(A=1\)
Tìm x, biết rằng:
a) 3.(10.x)=111
b)3+(10.x)=111
a)
3 . ( 10 . x ) = 111
3 . 10 . x = 111
30 . x = 111
x = \(\frac{37}{10}\)
b) 3 + ( 10 . x ) = 111
10 . x = 111 - 3
10 . x = 108
x = 108 : 10
x = 10.8
3. ( 10.x ) = 111
10.x = 111 : 3
10.x = 37
x = 37 : 10
x = 3,7
______________________
3 + ( 10.x ) = 111
10.x = 111 - 3
10.x = 108
x = 108 : 10
x = 10,8
Tìm \(x\), biết rằng :
a) \(3.\left(10.x\right)=111\)
b) \(3.\left(10+x\right)=111\)
c) \(3+\left(10.x\right)=111\)
d) \(3+\left(10+x\right)=111\)
a) \(3.\left(10.x\right)=111\)
\(10.x=37\)
\(x=\dfrac{37}{10}\)
b) \(3.\left(10+x\right)=111\)
\(10+x=37\)
\(x=27\)
c) \(3+\left(10.x\right)=111\)
\(10.x=108\)
\(x=\dfrac{54}{5}\)
d) \(3+\left(10+x\right)=111\)
\(x=111-3-10\)
\(x=98\)