a) 23 – 53 : 52 + 12.22 |
b) 5[(85 – 35 : 7) : 8 + 90] – 50 |
c) 2.[(7 – 33 : 32) : 22 + 99] – 100 |
d) 27 : 22 + 54 : 53 . 24 – 3.25 |
e) (35 . 37) : 310 + 5.24 – 73 : 7 |
f) 32.[(52 – 3) : 11] – 24 + 2.103 |
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a: \(2^3-5^3:5^2+12\cdot2^2\)
\(=8-5+48\)
\(=51\)
b: \(5\cdot\left[\left(85-35:7\right):8+90\right]-5\)
\(=5\cdot\left[10+90\right]-5\)
=495
\(a,2^2=4,2^3=8,2^4=16,2^5=32,2^6=64,2^7=128,2^8=256,2^9=512,2^{10}=1024\)
\(b,3^2=9,3^3=27,3^4=81,3^5=243\)
\(c,4^2=16,4^3=64,4^4=256\)
\(d,5^2=25,5^3=125,5^4=625\)
a) \(3.5^2+15.2^2-26\div2\)
= 3.25 + 15.4 - 13
= 75 + 60 - 13
= 135 - 13
= 122
b) \(5^3.2-100\div4+2^3.5\)
= 125.2 - 25 + 8.5
= 250 - 25 + 40
= 225 + 40
= 265
c)\(6^2\div9+50.2-3^3.33\)
= 36 : 9 + 100 - 9.33
= 4 + 100 - 297
= 104 - 297
= -193
d)\(3^2.5+2^3.10-81\div3\)
= 9.5 + 8.10 - 27
= 45 + 80 - 27
= 125 - 27
= 98
e) \(5^{13}\div5^{10}-25.2^2\)
= 53 - 25.4
= 125 - 100
= 25
f) \(20\div2^2+5^9\div5^8\)
= 20 : 4 + 5
= 5 + 5
= 10
a) 4 ; 8 ; 16 ; 32 ; 64
b) 9 ; 27 ; 81 ; 243
c) 16 ; 64 ; 256
d) 25 ; 125
Chúc bạn học tốt!! ^^
a) \(2^2=4\)
\(2^3=8\)
\(2^4=16\)
\(2^5=32\)
\(2^6=64\)
b) \(3^2=3\)
\(3^3=27\)
\(3^4=81\)
\(3^5=243\)
c) \(4^2=16\)
\(4^3=64\)
\(4^4=256\)
d) \(5^2=25\)
\(5^3=125\)
a)\(...A=\dfrac{2^{50+1}-1}{2-1}=2^{51}-1\)
b) \(...\Rightarrow B=\dfrac{3^{80+1}-1}{3-1}=\dfrac{3^{81}-1}{2}\)
c) \(...\Rightarrow C+1=1+4+4^2+4^3+...+4^{49}\)
\(\Rightarrow C+1=\dfrac{4^{49+1}-1}{4-1}=\dfrac{4^{50}-1}{3}\)
\(\Rightarrow C=\dfrac{4^{50}-1}{3}-1=\dfrac{4^{50}-4}{3}=\dfrac{4\left(4^{49}-1\right)}{3}\)
Tương tự câu d,e,f bạn tự làm nhé
a) \(2^3-5^3:5^2+12.2^2\)
\(=8-5+12.4\)
\(=8-5+48\)
\(=3+48\)
\(=51\)
b) \(5\left[\left(85-35:7\right):8+90\right]-50\)
\(=5\left[\left(85-5\right):8+90\right]-50\)
\(=5\left[80:8+90\right]-50\)
\(=5\left[10+90\right]-50\)
\(=5.100-50\)
\(=500-50\)
\(=450\)
c) \(2.\left[\left(7-3^3:3^2\right):2^2+99\right]-100\)
\(=2.\left[\left(7-3\right):4+99\right]-100\)
\(=2.\left[4:4+99\right]-100\)
\(=2.\left[1+99\right]-100\)
\(=2.100-100\)
\(=200-100\)
\(=100\)
d) \(2^7:2^2+5^4:5^3.2^4-3.2^5\)
\(=2^5+5.2^4-3.2^5\)
\(=32+5.16-3.32\)
\(=32+80-96\)
\(=112-96\)
\(=16\)
e) \(\left(3^5.3^7\right):3^{10}+5.2^4-7^3:7\)
\(=3^{12}:3^{10}+5.16-7^2\)
\(=3^2+80-49\)
\(=9+80-49\)
\(=89-49\)
\(=40\)
f) \(3^2.\left[\left(5^2-3\right):11\right]-2^4+2.10^3\)
\(=9.\left[\left(25-3\right):11\right]-16+2.1000\)
\(=9.\left[22:11\right]-16+2.1000\)
\(=9.2-16+2.1000\)
\(=18-16+2000\)
\(=2+2000\)
\(=2002\)
\(#WendyDang\)