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a)1824 - { 526 + 2x } = 1420 - 318
1824 - { 526 + 2x } = 1102
526 + 2x = 1824 - 1102
526 + 2x = 722
2x = 722 - 526
2x = 196
x = 196 : 2
x = 98
b) [ 215 - { 3x - 18 } ] = 5225 : 25
[ 215 - { 3x - 18 } ] = 209
{ 3x - 18 } = 215 - 209
{ 3x - 18 } = 6
3x = 6 + 18
3x = 24
x = 24 : 3
x = 8
k cho minh nha
{1824 - ( 526 + 2x ) }+ 318 = 1420
{ 1824 - ( 526 + 2x ) } = 1420 - 318
{ 1824 - ( 526 + 2x ) } = 1102
526 + 2x = 1824 - 1102
526 + 2x = 722
2x = 722 - 526
2x = 196
x = 196 : 2
x = 98
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x + ( x + 1 ) + ( x + 2 )+.........+ (x + 30)= 1240
x + ( x . 30 ) + ( 1 + 2 + .... + 30 ) = 1240
x . 31 + ( 1 + 2 + .... + 30 ) = 1240
x.31 +[( 31-1)+1] = 1240
x.31 + [( 30+1)*30:2] = 1240
x.31 + 465 = 1240
x.31 = 1240 - 465
x.31 = 775
x = 775 : 31
x = 25
1+2+3+...+x=210
(x+1).x:2=210
(x+1).x=210.2
(x+1).x=420
(x+1).x=(20+1).20
=>x=20
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Làm ơn giải nha giùm mik, mik đang cần gấp nha! Cảm ơn mọi người .
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\(\text{x+(x+1)+(x+2)+(x+3)+.............+(x+30)=1240}\)
\(=x+x+1+x+2+x+3+...+x+30=1240\)
\(=31x+1+2+3+...+30=1240\)
\(=31x+465=1240\)
\(\Rightarrow31x=1240-465=775\)
\(\Rightarrow x=775:31=25\)
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\(a.x+\left(x+1\right)+\left(x+2\right)+...+\left(x+30\right)=1240\)
\(\left(x+x+x+...+x\right)+\left(1+2+...+30\right)=1240\)
\(31x+465=1240\)
\(31x=775\)
\(x=25\)
\(b.\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=6550\)
\(\left(x+x+x+...+x\right)+\left(1+2+3+...+100\right)=6550\)
\(100x+5050=6550\)
\(100x=1500\)
\(x=15\)
x+(x+1)+(x+2)+....+(x+30)=1240
<=> (x+x+x+....+x)+(1+2+3+...+30)=1240
<=> 31x+\(\frac{\left(30+1\right)\cdot30}{2}\)=1240
<=> 31x+465=1240
<=> 31x=775
<=> x=25
Vậy x=25