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4x3 = 47 - 15
4x3 = 32
x3 = 32 : 4
x3 = 8
x3 = 23
x = 2.
Vậy x = 2.
-29.(85-47)-85.(47-29)
=-29.38-85.18
=-1102-1503
=-2605
-15.(23-29)+23-(15-29)
=-15.(-6)+23-(-14)
=90+23+14
=113+14
=127
-13.(55-29)+23.(15-29)
=-13.26+23.(-14)
=-338+(-322)
=-660
-10.(2+4)-5.(4-3)
=-10.6-5.1
=-60-5
=-65
a) 47.(-147) - 47.(-47)
= 47.(-147 + 47)
= 47 . (-100)
= -4700
b) 24.(15 - 4) + 4.(24 - 15)
= 24.15 - 25.4 + 4.25 - 4.15
= (24 - 4).15 - (25.4 - 4.25)
= 20 . 15
= 300
\(x^3+15=47\)
\(x^3=47-15\)
\(x^3=32\)
\(\Rightarrow\) \(x=?????\)
\(4^x:2+15=47\)
\(\Rightarrow4^x:2=32\)
\(\Rightarrow4^x=64\)
\(\Rightarrow4^x=4^3\)
Vậy \(x=3\)
4x : 2 + 15 = 47
4x : 2 = 47 - 15
4x : 2 = 32
4x = 32 x 2
4x = 64
4x = 43
Vậy x = 3
1, 42 x 53 + 47 x 156 - 47 x 114
= 42 x 53 + 47 x ( 156 - 114 )
= 42 x 53 + 47 x 42
= 42 x ( 53 + 47 )
= 42 x 100
= 4200
2, 53 x ( 51 + 4 ) + 53 x ( 49 + 96 ) + 53
= 53 x 51 + 53 x 4 + 53 x 49 + 53 x 96
= 53 x ( 51 + 49 ) + 53 x ( 96 + 4 ) + 53
= 53 x 100 + 53 x 100 + 53
= 5300 + 5300 + 53
= 10653
3, 42 x ( 15 + 96 ) + 6 x ( 25 + 4 ) x 7
= 42 x 15 + 42 x 96 + 42 x 25 + 42 x 4
= 42 x ( 15 + 25 ) + 42 x ( 96 + 4 )
= 42 x 40 + 42 x 100
= 42 x ( 100 + 40 )
= 42 x 140
= 5880
Tk mk nha !! ~
42. 53 + 47. 156 - 47. 114 = 42.53 +47.(156-114)
=42.53 +47. 42
= 42(53+47)
= 42.100 = 4200
53. ( 51 + 4 ) + 53. ( 49 + 96 ) + 53 = 53(51+4+49+96+1)
= 53. 201 = 10653
42. ( 15 + 96 ) + 6. ( 25 +4 ). 7 = 42. ( 15 + 96 ) + 42(25+4)
= 42(15+96+25+4)
= 42. 140 = 5880
mk lm xong rồi add friend nha
536x27-(825+219):18+153:152-42x3
=536x27-(825+219):18+151-16x3
=536x27-1044:18+15-16x3
=14472-58+15-48
=14414+15-48
=14429-48
=14381
a)1050 : 15 - 150 : 15 + 150 : 19 + 1940
=(1050 : 15 +1940) +(-150 : 15 + 150 :19 )
=(1050 : 15 +29100 : 15) - 150 : ( 15 -19 )
=(1050 + 29100) : 15 - 150 :(-4)
=30150 :15 +37,5
=2010 +37,5
=2047,5
b)53.39 + 47.39 - 53.21 - 47.21
=39(53 + 47) - 21(53 + 47)
=100(39-21)
=100.18
=1800
c)2.53.12 + 4.6.87
=24.53 + 24.87
=24(53 + 87)
=24.140
=3360
a)1050 : 15 - 150 : 15 + 150 : 19 + 1940
= (1050 : 15 +1940) +(-150 : 15 + 150 :19 )
= (1050 : 15 +29100 : 15) - 150 : ( 15 -19 )
= (1050 + 29100) : 15 - 150 :(-4)
=30150 :15 +37,5
=2010 +37,5
=2047,5
l) (x + 9) . (x2 – 25) = 0
<=> (x + 9) . (x – 5) . (x + 5) = 0
<=> \(\left[{}\begin{matrix}\text{x + 9 = 0}\\x-5=0\\x+5=0\end{matrix}\right.\left[{}\begin{matrix}x=-9\\x=5\\x=-5\end{matrix}\right.\)
Vậy S = \(\left\{-9,5,-5\right\}\)
e) |x - 4 |< 7
<=> \(\left[{}\begin{matrix}x-4=7\\x-4=-7\end{matrix}\right.< =>\left[{}\begin{matrix}x=11\\x=-3\end{matrix}\right.\)
Vậy S = \(\left\{11;-3\right\}\)
I,(x+9).(x^2-25)=0
tương đương:x+9=0
x^2-25=0
tương đương : x=-9
x=5
e,\(\left|x-4\right|\)=7
tương đương x-4=4
x-4=-4
tương đương :x=0
x=-8
\(4\cdot x^3+15=47\)
\(4\cdot x^3=47-15\)
\(4\cdot x^3=32\)
\(x^3=32:4\)
\(x^3=8\)
\(x^3=2^3\)
\(=>x=2\)