[2009-x]:29+32=100
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(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
#)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
\(e,\left(x-2\right).3-270:45=120\)
\(\Rightarrow\left(x-2\right).3-6=120\)
\(\Rightarrow\left(x-2\right).3=126\)
\(\Rightarrow x-2=42\)
\(\Rightarrow x=44\)
Bài làm
a) 16 . 34 + 66 . 16 - 72
= 16 . ( 34 + 16 ) - 72
= 16 . 80 - 72
= 1280 - 72
= 1208
b) 4,25 . 58,47 + 125 + 41,53 . 4,25
= 4,25 . ( 58,47 + 41,53 ) + 125
= 4,25 . 100 + 125
= 425 + 125
= 550
c) x : 15 + 42 = 15 + 25 . 8
x : 15 + 42 = 15 + 200
x : 15 + 42 = 215
x : 15 = 215 - 42
x : 15 = 173
x = 173 . 15
x = 188
Vậy x = 188
~ Hai câu cuối làm nốt nha, hết thời gian cho một câu hỏi r. ~
# Học tốt #
\(180-\left(x-45\right)\div2=120\)
\(\left(x-45\right)\div2=180-120\)
\(\left(x-45\right)\div2=60\)
\(x-45=60\times2\)
\(x-45=120\)
\(x=120+45\)
\(x=165\)
\(\left(2009-x\right)\div29+32=100\)
\(\left(2009-x\right)\div29=100-32\)
\(\left(2009-x\right)\div29=68\)
\(2009-x=68\times29\)
\(2009-x=1972\)
\(x=2009-1972\)
\(x=37\)
\(\left(x-2\right)\times3-270\div45=120\)
\(\left(x-2\right)\times3-6=120\)
\(\left(x-2\right)\times3=120+6\)
\(\left(x-2\right)\times3 =126\)
\(x-2=126\div3\)
\(x-2=42\)
\(x=42+2\)
\(x=44\)
\(\left(x+0,2\right)+\left(x+0,7\right)+\left(x+1,2\right)+...+\left(x+4,2\right)+\left(x+4,7\right)=65,5\)
\(\left(x+x+x+..+x+x\right)+\left(0,2+0,7+1,2+...+4,2+4,7\right)=65,5\)
\(10x+\frac{\left(0,2+4,7\right)\times10}{2}=65,5\)
\(10x+24,5=65,5\)
\(10x=65,5-24,5\)
\(10x=41\)
\(\Rightarrow x=4,1\)
\(\left(2008-x\right):29+32=100\)
\(\Leftrightarrow\left(2008-x\right):29=68\)
\(\Leftrightarrow2008-x=1972\)
\(\Leftrightarrow x=36\)
(Tíck cho mìk vs nhá!)
( 2008 - x ) : 29 + 32 = 100
( 2008 - x ) : 29 = 100 - 32
( 2008 - x ) : 29 = 68
2008 - x = 68 x 29
2008 - x = 1972
x = 2008 - 1972
x = 36
Vậy x = 36
( 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
bài 2 tìm x
a,106- ( x+ 7) =9
x+7 = 106 - 9
x+7 = 107
x= 107 - 7
x=100
b, 2 x ( x+ 4) + 5 =65
2 x (x+4) = 65 - 5
2 x (x+4) = 60
x+4 = 60:2
x+4= 30
x= 30 - 4
x=26
c, (16x x -32) x 45=0
16 x X - 32 = 0: 45
16 x X - 32 =0
16 x X = 0 + 32
16 x X = 32
X= 32:16
X=2
d, x+4 x x = 100 : 5
X + 4 x X = 20
(1+4) x X = 20
5 x X = 20
X= 20:5
X=4
a) \(437\times136-437\times125\)
\(=437\times\left(136-125\right)\)
\(=437\times11\)
\(=4807\)
b) \(2009\times71+29\times2009\)
\(=2009\times\left(71+29\right)\)
\(=2009\times100\)
\(=200900\)
a) 437 x 136 - 437 x 125
= 437 x (136 - 125 )
= 437 x 11
= 4807
b) 2009 x 71 + 29 x 2009
= 2009 x ( 71 + 29 )
= 2009 x 100
= 200900
( 2009 - x ) : 29 + 32 = 100
( 2009 - x ) : 29 = 100 - 32
( 2009 - x ) : 29 = 68
( 2009 - x ) = 68 . 29
2009 - x = 1972
x = 2009 - 1972
x = 37
[2009 - x] : 29 =100-32
[2009-x] : 29 =68
2009-x =68x29
2009-x=1972
x=2009-1972
x=37