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A =118.75
B=125 -5 .(3.X -1) =25
5.(3.X-1) =100
3.X-1=20
3X =21
X=7
\(2.2^2.2^3.2^4.........2^{100}\)
\(=2^{1+2+3+4+......+100}\)
\(=2^{5050}\)
A=(2+22)+(23+24)+....+(21995+21996)(NHÓM SỐ BẠN NHÉ)
A=6+6.22+....+6.21994
A=6.(1+22+...+21994) CHIA HẾT CHO 6
VẬY...( BẠN LÀM RỒI 100%)
\(\left[17^2-\left(3-5\right)^2\right].\left[2^3-\left|-1-2\right|^2\right]\)
\(=\left[289-\left(-2\right)^2\right].\left[2^3-\left|-3\right|^2\right]\)
\(=\left(289-4\right).\left(8-3^2\right)\)
\(=285.\left(8-9\right)\)
\(=285.\left(-1\right)\)
\(=-285\)
[130 - 3.(5.24 - 52.2) : 23]
= [ 130 - 3.30:23]
= 130 - 11,25
= 118,75
b) 125 -5.(3x-1) = 55:53
125 -5.(3x-1) = 25
5.(3x-1) = 100
3x-1 = 20
3x = 21
x = 7
c) 4x-1 + 40 = 65
4x:4 + 1 = 65
4x:4 = 64
4x = 256 = 44
=> x = 4
a) 2\(^3\).15 -[115-(12-5)\(^2\)]
= 8.15-[115-(7)\(^2\)]
= 120-[115-49]
= 120-66
= 54
c)4.5\(^2\)- 81:3\(^2\)+3\(^2\).22-3\(^3\).19
=4.25-81:9+9.22-27.19
=100-9+198-513
=91+198-513
=289-513
=(-224)
Câu b sai đề nhé bn
\(a,[\left(8.x-12\right):4].3^3.3=3^6.6\)
\(\left(8x-12\right):4=54\)
\(8x-12=216\)
\(8x=228\)
\(x=28,5\)
\(b,41-2^{x+1}=9\)
\(2^{x+1}=41-9\)
\(2^{x+1}=32\)
\(2^{x+1}=2^5\)
\(\Rightarrow x+1=5\)
\(\Rightarrow x=4\)
lộn
\(\left|\left(-3\right)^2-\left(-2\right)^3\right|:\left|4-\left(-2\right)^2+30^0\right|\)
\(=\left|9-\left(-8\right)\right|:\left|4-4+1\right|\)
\(=\left|9+8\right|:\left|1\right|\)
\(=\left|17\right|:1\)
\(=17:1\)
\(=17\)
\(\left[\left(-3\right)^2-\left(-2\right)^3\right]:\left[4-\left(-2\right)^2+30^0\right]\)
\(=\left[9-\left(-8\right)\right]:\left(4-4+1\right)\)
\(=\left(9+8\right):1\)
\(=17:1\)
\(=17\)