bai 1
13/11.22/66-x*2=7/16
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A = 2 3 − 5 − 11 .22 = − 28 3 B = − 9 4 . 8 − 3 + 1 6 = 37 6 C = ( 1 − 8 ) . 4 7 = 4
Bài 1:
a) -567 - (-113) + (-113 + 567) - 2009
= [(-567) + 567] + [(-113) + (-113)] - 2009
= 0 + (-226) - 2009
= -226 - 2009
= -2235
Ta có:
A = 1 + 3 + 5 + 7 +... + 101
A = \(\frac{102.51}{2}=2601\)
M = 16 - 18 + 20 - 22 + 24 - 26 + .. + 64 - 66 + 68
M = ( 16 - 18 ) + ( 20 - 22 ) + ( 24 - 26 ) + ... + ( 64 - 66 ) + 68
M = (- 2 + - 2 + -2 + ... + - 2 ) + 68
M = 25/2 . ( - 2 ) + 68
M = -25 + 68
M = 43
H = ( 1 + 2 + 3 +...+ 99 ) x ( 13 x 15 - 12 x 15 - 15 )
H = ( 1 + 2 + 3 +...+ 99 ) x { (13 - 12 - 1) x 15 }
H = ( 1 + 2 + 3 +...+ 99 ) x 0
H = 0
G = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 - 11 - 12 + 13 + 14 - ... + 301 + 302
G = ( 1 + 2 ) + ( -3 - 4 ) + ( 5 + 6 ) + ( -7 - 8 ) + ( 9 + 10 ) + ( - 11 - 12 ) + ( 13 + 14 ) -...+ ( 301 + 302 )
G = ( 3 - 7 ) + ( 11 - 15 ) + ( 19 - 23 ) + 27 - ... + 603
G = -4 + - 4 + -4 + 27 - ... + 603
G = 75 x ( -4 ) + 603
G = -300 + 603
G = 303
2.
a) 1 + 2 + 3 + 4 +...+ 99 + 100 + 2 x X = 5052
= > \(\frac{100.101}{2}\)+ 2 x X = 5052
= > 5050 + 2 x X = 5052
= > 2X = 2
= > X = 1
66 x 25 +5 x 66+66 x 14 + 33 x 66
= 66 x ( 25+5+14+33)
= 66 x 77
= 11 x 6 x 11 x 7
= 11 x( 6x 7)
= 11 x 42
= 462
tick cho mình nha,Mạnh Dũng
1)
a)\(x+\dfrac{3}{22}=\dfrac{27}{121}.\dfrac{11}{9}\)
\(x+\dfrac{3}{22}=\dfrac{3}{11}\)
\(x=\dfrac{6}{22}-\dfrac{3}{22}\)
\(x=\dfrac{3}{22}\)
\(\frac{x}{7}=\frac{x+16}{35}\)
\(\Leftrightarrow x\cdot35=7\left(x+16\right)\)
\(\Leftrightarrow35x=7x+112\)
\(\Leftrightarrow35x-7x=112\)
\(\Leftrightarrow28x=112\)
\(\Leftrightarrow x=4\)
Vậy x = 4
\(\frac{8}{x}=\frac{7}{x-16}\)
\(\Leftrightarrow8\left(x-16\right)=x\cdot7\)
\(\Leftrightarrow8x-128=7x\)
\(\Leftrightarrow8x-7x=128\)
\(\Leftrightarrow x=128\)
Vậy x = 128
a,\(\frac{x}{7}=\frac{x+16}{35}< =>\frac{5x}{35}=\frac{x+16}{35}\)
\(< =>5x=x+16\)
\(< =>4x=16< =>x=4\)
b,\(\frac{8}{x}=\frac{7}{x-16}\)\(< =>8x-128=7x\)
\(< =>x=128\)
\(\frac{13}{11}\cdot\frac{22}{66}-x\cdot2=\frac{7}{16}\)
\(\Leftrightarrow\frac{13}{11}\cdot\frac{1}{3}-2x=\frac{7}{16}\)
\(\Leftrightarrow\frac{13}{33}-2x=\frac{7}{16}\)
\(\Leftrightarrow2x=-\frac{23}{528}\)
\(\Leftrightarrow x=-\frac{23}{1056}\)
sẵn bán nick luôn:)