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a) x3 - 23 = 25 - ( 316 : 314 + 28 : 2 6 )
x3 - 23 = 25 -( 32 + 22 )
x3 - 23 = 25- ( 9 + 4 )
x3 - 23= 25 - 13
x3 - 8 = 32 - 13
x3 - 8 = 19
x3 = 19 + 8
x3 = 27
x3 = 33
=> x = 3
Vậy x =3
b) ( x2 - 1)4 = 81
( x2 - 1 )4 = 34
=> x2 - 1 = 3
x2 = 3 + 1
x2 = 4
x2 = 22
=> x = 2
Vậy x= 2
c) 5x-2 - 32 = 24 - (68 : 66 - 62 )
5x-2 - 32 = 16 - ( 62 - 62)
5x-2 - 9 = 16 - 0
5x-2 - 9= 16
5x - 2 = 16 + 9
5x - 2 = 25
5x - 2 = 52
=> x - 2 = 2
x = 2 + 2
x = 4
Vậy x = 4
d) 3x + 42 = 196 : ( 193 . 192 ) 3.12005
3x + 16 = 196 : 195 . 3 . 1
3x + 16 = 19 . 3
3x + 16 = 57
3x = 57 - 16
3x = 41
Hình như phép này đề bài sai rồi thì phải
Bài 1 :
a/ \(a^3.a^9=a^{3+9}=a^{12}\)
b/\(\left(a^5\right)^7=a^{5.7}=a^{35}\)
c/ \(\left(a^6\right).4.a^{12}=a^{24}.a^{12}.4=a^{24+12}.4=a^{36}.4\)
d/ \(\left(2^3\right)^5.\left(2^3\right)^3=2^{15}.2^9=2^{15+9}=2^{24}\)
e/ \(5^6:5^3+3^3.3^2\)
\(=5^3+3^5=125+243=368\)
i/ \(4.5^2-2.3^2\)
\(=2^2.5^2-2.3^2\)
\(=2^2.25-2^2.14\)
\(=2^2.\left(25-14\right)\)
\(=2^2.11\)
\(=4.11=44\)
a)120-3(x+4)=23
=>3(x+4)=120-23
=>3(x+4)=97
=>x+4=97:3
=>x+4=\(\frac{97}{3}\)
=>x=\(\frac{97}{3}\)-4
=>x=\(\frac{85}{3}\)
Vậy x=\(\frac{85}{3}\)
b)[(4x+28).3+55]:5=35
=>(4x+28).3+55=35.5
=>(4x+28).3+55=175
=>(4x+28).3=175-55
=>(4x+28).3=120
=>4x+28=120:3
=>4x+28=40
=>4x=40-28
=>4x=12
=>x=12:4
=>x=3
Vậyx= 3
c)\((12x-4^3).8^3=4.8^4\)
=>\(12x-64=4.8^4:8^3\)
=>12x-64=4.8
=>12x-64=32
=>12x=96
=>x=96:12
=>x=8
Vậy x=8
d)720:[41-(2x-5)]=23.5
=>720:[41-2x-5)]=40
=>41-(2x-5)=720:40
=>41-(2x-5)=18
=>2x-5=41-18
=>2x-5=23
=>2x=23+5
=>2x=28
=>x=28:;2
=>x=14
Vậy x=14
a, 120 - 3 [ x+4]=23
3 [x+4]= 120-23 = 97
3x = 97-4
3x= 93
x= 93:3
x=31
em bt làm mỗi bài này thui mà ko bt đúng ko
a, \(6^2:4.3+2.5^2=36:4.3+2.25\)'
\(=9.3+50=27+50=77\)
b, \(2\left(5.4^2-18\right)=2\left(5.16-18\right)\)
\(=2.5.16-2.18=10.16-36\)
\(=160-36=124\)
c, \(5.4^2-18:3^2=5.4.4-18:3^2\)
\(=20.4-18:9=80-2=78\)
\(a,6^2:4.3+2.5^2\)
\(=9.3+2.25\)
\(=27+50\)
\(=77\)
\(b,2.\left(5.4^2-18\right)\)
\(=2.\left(80-18\right)\)
\(=2.62\)
\(=124\)
\(c,5.4^2-18:3^2\)
\(=5.16-18:9\)
\(=80-2\)
\(=78\)
\(d,3^3.18-3^3.12\)
\(=3^3.6.3-3^3.6.2\)
\(=3^3.6.\left(3-2\right)\)
\(=27.6.1\)
\(=162\)
\(e,39.213+84.39\)
\(=39.\left(213+84\right)\)
\(=39.297\)
\(=11583\)
\(j,80-\left[130-\left(12-4\right)^2\right]\)
\(=80-\left[130-8^2\right]\)
\(=80-66\)
\(=14\)
Học tốt
b) 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + ... + 299 - 300 + 301 + 302
= 1+ ( 2- 3- 4+ 5) + ( 6- 7- 8+ 9) +...+( 299- 300+ 301+ 302)
=1+ 0+ 0+...+ 0
=0
c) 1 + 2 + 22 + 23 + 24 + ... + 299 + 2100
Gọi 1 + 2 + 22 + 23 + 24 + ... + 299 + 2100 là A
2.A=2 + 22 + 23 + 24 + 25 +...+ 2100 + 2101
2.A - A = 2101 - 1
A = 2101 -1
Tính:
a,245-4×[16÷8+2×(4×3^2-9)]
=241×(4×27)
=241×108
=26028
b,375÷5^3+(3^8+3^6+2,2^3)
=375÷125+(7290+10,648)
=3+7300,648
=7303,648
a) 245 - 4 [ 16 : 8 + 2 ( 4 . 32 - 9 ) ] = 21
b) 375 : 53 + ( 38 + 36 + 2 , 23 ) = 7295.8