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\(180-\left(x-45\right)\div2=120\)
\(\left(x-45\right)\div2=180-120\)
\(\left(x-45\right)\div2=60\)
\(x-45=60\times2\)
\(x-45=120\)
\(x=120+45\)
\(x=165\)
\(\left(2009-x\right)\div29+32=100\)
\(\left(2009-x\right)\div29=100-32\)
\(\left(2009-x\right)\div29=68\)
\(2009-x=68\times29\)
\(2009-x=1972\)
\(x=2009-1972\)
\(x=37\)
\(\left(x-2\right)\times3-270\div45=120\)
\(\left(x-2\right)\times3-6=120\)
\(\left(x-2\right)\times3=120+6\)
\(\left(x-2\right)\times3 =126\)
\(x-2=126\div3\)
\(x-2=42\)
\(x=42+2\)
\(x=44\)
\(\left(x+0,2\right)+\left(x+0,7\right)+\left(x+1,2\right)+...+\left(x+4,2\right)+\left(x+4,7\right)=65,5\)
\(\left(x+x+x+..+x+x\right)+\left(0,2+0,7+1,2+...+4,2+4,7\right)=65,5\)
\(10x+\frac{\left(0,2+4,7\right)\times10}{2}=65,5\)
\(10x+24,5=65,5\)
\(10x=65,5-24,5\)
\(10x=41\)
\(\Rightarrow x=4,1\)
(2009-x) : 29 + 32 = 100
(2009-x): 29 = 68
2009-x = 68 x 29
2009 - x = 2001
x= 2009 - 2001
x=8
( 2009 - x ) : 29 + 32 = 100
( 2009 - x ) : 29 = 100 - 32
( 2009 - x ) : 29 = 68
2009 - x = 68 x 29
2009 - x = 1972
x = 2009 - 1972
x = 37
a, x + 27 = 96 + 17
=> x + 27 = 113
=> x = 113 - 27
=> x = 86
b, x - 210 : 21 = 25
=> x - 10 = 25
=> x = 25 + 10
=> x = 35
c, (x + 8,7) . 10,8 = 270
=> x + 8,7 = 270 : 10,8
=> x + 8,7 = 25
=> x = 25 - 8,7
=> x = 16,3
d, 7 . x - 4 . x = 35 - 2
=> 7 . x - 4 . x = 33
=> x . (7 - 4) = 33
=> x . 3 = 33
=> x = 33 : 3
=> x = 11
#) Dấu "." là nhân nhé!
~Study well~
#KSJ
( 2015 - x ) : 29 + 32 = 100
( 2015 - x ) : 29 = 100 - 32
( 2015 - x ) : 29 = 68
2015 - x = 68 x 29
2015 - x = 1972
x = 2015 - 1972
x = 43
L i k e nha các bạn !!!
(2015-x):26=100-32
(2015-x):26=68
2015-x=68x26
2015-x=1768
x=2015-1768
x=247
a,64 x 25 + 35 x 25 +25=25.(64+35+1)=25.100=2500
b) 58 x 42 + 32 x 8 + 5=2436+256+5=2697
c) A =1 +2+3+4+...+100=(100+1)x[(100-1):1+1]:2=5050
\(64\times25+35\times25+25\)
\(=25\times\left(64+35+1\right)\)
\(=25\times100\)
\(=2500\)
#)Giải :
a)\(\left(x-149\right)\div35=270\)
\(\Leftrightarrow x-149=9450\)
\(\Leftrightarrow x=9599\)
\(a,(x-149):35=270\)
\(\Leftrightarrow x-149=9450\)
\(\Leftrightarrow x=9450+149=9599\)
Vậy x = 9599
\(b,(2009-x):29+32=100\)
\(\Leftrightarrow(2009-x):29=68\)
\(\Leftrightarrow2009-x=1972\)
\(\Leftrightarrow x=2009-1972=37\)
Vậy x = 37
\(c,x+472=918\)
\(\Leftrightarrow x=918-472=446\)
Vậy x = 446