2^4.5-[131-(31-4)^2]
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\(2^4.5-\left[131-\left(13-4\right)^2\right]=16.5-\left[131-81\right]=80-50=30\)
2^4.5-[131-(130-4)^2]
=16.5-[131-126^2]
=80-[131-15876]
=80--15745
=80+15745
=15825
\(2^4.5-\left[131-\left(130-4\right)^2\right]=1280-\left[131-15876\right]=1280-\left(-15745\right)=17025\)
\(2^4.5-\left[131-\left(13-4\right)^2\right]\)
\(=2^4.5-\left(131-9^2\right)\)
\(=2^4.5-\left(131-81\right)\)
\(=2^4.5-50\)
\(=16.5-50\)
\(=80-50\)
\(=30\)
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
\(2^4.5-\left[131-\left(31-4\right)^2\right]\)
<=>\(80-\left[131-729\right]\)
<=>\(80-\left(-598\right)\)
<=>\(678\)
=))))))))))))))))))))))))))))))