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32 . 41+ 46.73 + 32.59 +73.54
=32.(41+59)+73.(46+54)
=32.100+73.100
=100.(32+73)
=100.105 = 10500
32*41+46*73+32*59+73*54
=(32*(41+59))+(73*(54+46))
=(32*100)+(73*100)
=3200+7300
=11500 k cho minh nha thuuuuuuuuuuu
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234 - ( 34 - 20 . x ) = 100
34 - 20 . x = 234 - 100
34 - 20 . x = 134
20 . x = 34 - 134
20 . x = -100
x = -100 : 20
x = -5
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\(\left(x-4\right)^9=49.\left(x-4\right)^7\\ =>\left(x-4\right)^9:\left(x-4\right)^7=49\\ =>\left(x-4\right)^2=49\\ =>\left[{}\begin{matrix}x-4=7\\x-4=-7\end{matrix}\right.\\ =>\left[{}\begin{matrix}x=11\\x=-3\end{matrix}\right.\)
(x - 4)9 = 49 . (x - 4)7
(x - 4)9 : (x - 4)7 = 49
(x - 4)2 = 72 = (-7)2
TH1 : TH2 :
(x - 4)2 = 72 (x - 4)2 = (-7)2
x - 4 = 7 x - 4 = -7
x = 7 + 4 x = -7 + 4
x = 11 x = -3
Vậy x = 11 Vậy x = -3
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A. ( x - 34 ) . 15 = 0
x - 34 = 0
x = 0 + 34
x = 34
Vậy x = 34
B. 18 ( x - 16 ) = 18
x - 16 = 18 : 18
x - 16 = 1
x = 1 + 16
x = 17
Vậy x = 17
A. ( x - 34 ) . 15 = 0
x - 34 = 0 . 15
x - 34 = 0
x = 34
B . 18 . ( x - 16 ) = 18
x - 16 = 18 : 18
x - 16 = 1
x = 17
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\(34\left(2x-6\right)=0\)
\(2x-6=0\)
\(2x=6\)
\(x=3\)
T i c k mk nha ^^
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\(\text{a/96-3(x+1)=42}\)
\(3\left(x+1\right)=54\)
\(x+1=54:3\)
\(x+1=18\)
\(\Rightarrow x=17\)
\(\text{b/2.x-18=20}\)
\(2x=38\)
\(x=38:2\)
\(x=19\)
\(\text{c/134-5.(x+4)=34}\)
\(5\left(x+4\right)=100\)
\(x+4=100:5\)
\(x+4=20\)
\(\Rightarrow x=16\)
học tốt
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a) 96-3(x+1)=42
3(x+1)=96-42
3(x+1)=54
x+1=54:3
x+1=18
x=18-1
Vậy x=17
b) 2x-18=20
2x=20+18
2x=38
x=38:2
x=19
Vậy x=19.
c) 134-5(x+4)=34
5(x+4)=134-34
5(x+4)=100
x+4=100:5
x+4=20
x=20-4
x=16
Vậy x=16.
a) 96-3(x+1)=42
3(x+1)=96-42
3(x+1)=54
x+1=54:3
x+1=18
x=18-1
x=17
Vậy x=17
b)2.x-18=20
2.x =20+18
2.x =38
x =38:2
x =19
Vậy x=19
c)134-5.(x+4)=34
5.(x+4)=134-34
5.(x+4)=100
x+4 =100:5
x+4 =20
x =20-4
x =16
Vậy x=16
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Tham khảo:
A=1.2+2.3+3.4+...+2013.2014
3A = 1.2.3 + 2.3.3 + 3.4.3 +...+ 2013.2014.3
Mà: 1.2.3 = 1.2.3
2.3.3 = 2.3.4 - 2.3.1
3.4.3 = 3.4.5 - 3.4.2
2012.2013.3 = 2012.2013.2014 - 2012.2013.2011
2013.2014.3 = 2013.2014.2015 - 2013.2014.2012
=> 3S = 2013.2014.2015
=> A = 2013.2014.2015 / 3 = 2723058910
\(B=\frac{72^3.54^2}{108^4}\)
\(B=\frac{2^9.3^6.2^2.3^6}{2^8.2^{12}}=2^3=8\)
B = 8
..............
mik nha