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\(x+18954:3^5=4.5^3\)
\(x+78=500\)
\(x=500-78\)
\(x=422\)
Vậy x = 422 .
\(\left(4^3-11x\right).5^3=4.5^4\)
\(\Rightarrow\left(4^3-11x\right)=4.5^4\div5^3\)
\(\Rightarrow4^3-11x=20\)
\(\Rightarrow11x=4^3-20\)
\(\Rightarrow11x=44\)
\(\Rightarrow x=4\)
(43 - 11 . x) . 53 = 4 . 54 = 2500
(43 - 11 . x) = 2500 : 125
43 - 11 . x = 20
11 . x = 43 - 20
11 . x = 44
x = 44 : 11
x = 4
Học tốt!!!
c) {[(20 - 2.3).5] - 2.5} : 2 + (4.5)²
= {(20 - 6).5] - 10} : 2 + 20²
= (14.5 - 10) : 2 + 400
= (70 - 10) : 2 + 400
= 60 : 2 + 400
= 30 + 400
= 430
d) (1² + 2² + 3² + ... + 100²) . (2⁴ - 4²)
= (1² + 2² + 3² + ... + 100²) . (16 - 16)
= (1² + 2² + 3² + ... + 100²) . 0
= 0
Bài 2
a) -2x < 5
2x > 5
x > 5/2
b) [31 - (x + 5)].11 = 121
31 - (x + 5) = 121 : 11
31 - (x + 5) = 11
x + 5 = 31 - 11
x + 5 = 20
x = 20 - 5
x = 15
c) (x + 1)³ = 27
(x + 1)³ = 3³
x + 1 = 3
x = 3 - 1
x = 2
\(257-\left(3x+25\right)=157\)
\(3x+25=257-157\)
\(3x+25=100\)
\(3x=75\)
\(x=25\)
vay \(x=25\)
\(x-140:35=270\)
\(x-4=270\)
\(x=274\)
vay \(x=274\)
\(23-\left(x:13\right)=18\)
\(\frac{x}{13}=5\)
\(\frac{x}{13}=\frac{65}{13}\)
\(\Rightarrow x=65\)
vay \(x=65\)
\(9\left(x+5\right)-13=671\)
\(9x+45=684\)
\(9x=639\)
\(x=71\)
vay \(x=71\)
\(9\left(4x\right)-13=24\)
\(36x=37\)
\(x=\frac{37}{36}\)
vay \(x=\frac{37}{36}\)
\(\left(x-5\right)-34:17=1\)
\(\left(x-5\right)-2=1\)
\(x-5=3\)
\(x=8\)
vay \(x=8\)
\(\left(2x-7\right).3=3\)
\(2x-7=1\)
\(2x=8\)
\(x=4\)
vay \(x=4\)
\(\left(3x-5\right):2=4.5\)
\(\left(3x-5\right):2=20\)
\(3x-5=10\)
\(3x=15\)
\(x=5\)
vay \(x=5\)
con lai lam tuong tu
mk moi tay roi nen ban tu lam vay
Ta có: \(x+18954\div3^5=4.5^3\)
\(\Leftrightarrow x+18954\div243=4.125\)
\(\Leftrightarrow x+78=500\)
\(\Rightarrow x=422\)
x + 18954 : 35 = 4 . 53
=> x + 18954 : 243 = 4 . 125
=> x + 78 = 500
=> x = 422
Vậy x = 422