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17 tháng 10 2015

a)25.4:32=25.22:25=25+2-5=22=4

b)3.27:34=3.33:34=34:34=1

c)(29.16+29.32):210

=29.(16+32):210

=48:210-9

=48:2

=24

d)Bạn chữa lại dề nha

(34.57-92.21):35

=(34.57-34.22):35

=34.(57-22):35

=34.35:35

=34

=81

  (34.57-92.21):35

=(81.57-81.21):243

=[81.(57-21)]:243

=(81.36):243

=2916:243

=12

\(\left(3^4.57-9^2.21\right):3^5\)

\(=\left(81.57-81.21\right):243\)

\(=\left(81\left(57-21\right)\right):243\)

\(=\left(81.36\right):243\)

\(=2916:243\)

\(=12\)

9 tháng 8 2018

(34 . 57 - 92 . 21): 35

= (34 . 57- 34 .21): 35

= 34 . (57 - 21) : 35

= 2916 : 35

= 12

14 tháng 1 2019

a. \(\left(2^9.16+2^9.34\right):2^{16}\)

\(=2^9\left(17+34\right):2^{16}\)

\(=50:2^7\)

=\(\dfrac{50}{128}=\dfrac{25}{64}=\left(\dfrac{5}{8}\right)^2\)

b. \(\left(3^4.57-9^2.21\right):3^5\)

\(=\left(3^4.3.19-3^4.3.7\right):3^5\)

\(=\left(3^5.19-3^5.7\right):3^5\)

\(=3^5.\left(19-7\right):3^5\)

=12

14 tháng 11 2019

\(\left(3^4\cdot57-9^2\cdot21\right):3^5\)

\(=\)\(\left(3^4\cdot57-\left(3^2\right)^2\cdot21\right):3^5\)

\(=\)\(\left(3^4\cdot57-3^4\cdot21\right):3^5\)

\(=\)\(\left(3^4\cdot\left(57-21\right)\right):3^5\)

\(=\)\(\left(81\cdot36\right):243\)

\(=\)\(2916:243\)

\(=\)\(12\)

10 tháng 10 2016

a, \(11^{25}\div11^{23}-3^5\div\left(1^{10}+2^3\right)-60\)

\(=11^{25}\div11^{23}-3^5\div\left(1+8\right)-60\)

\(=11^{25}\div11^{23}-3^5\div3^2-60\)

\(=11^2-3^3-60\)

\(=121-27-60\)

\(=94-60=34\)

b, \(2345-1000\div\left[19-2\left(21-18\right)^2\right]\)

\(=2345-1000\div\left[19-2.3^2\right]\)

\(=2345-1000\div\left[19-2.9\right]\)

\(=2345-1000\div1=2345-1000=1345\)

c, \(128-\left[68+8\left(37-35\right)^2\right]\div4\)

\(=128-\left[68+8.2^2\right]\div4\)

\(=128-\left[68+8.4\right]\div4\)

\(=128-\left[68+32\right]\div4\)

\(=128-100\div4=128-25=103\)

d, \(107-\left\{38+\left[7.3^2-24\div6+\left(9-7\right)^3\right]\right\}\div15\)

\(=107-\left\{38+\left[7.9-4+2^3\right]\right\}\div15\)

\(=107-\left\{38+\left[63-4+8\right]\right\}\div15\)

\(=107-\left\{38+\left[59+8\right]\right\}\div15\)

\(=107-\left\{38+67\right\}\div15\)

\(=107-105\div15\)

\(=107-7=100\)

e, \(50-\left[50-\left(2^3.5\right)\div2+3\right]\)

\(=50-\left[50-8.5\div2+3\right]\)

\(=50-\left[50-40\div2+3\right]\)

\(=50-\left[50-20+3\right]\)

\(=50-\left[30+3\right]\)

\(=50-33=17\)

10 tháng 10 2016

Bài 2 :

a, \(5\left(x-9\right)=350-5^2\)

\(5\left(x-9\right)=350-25\)

\(5\left(x-9\right)=325\)

\(x-9=325\div5\)

\(x-9=65\)

\(\Rightarrow x=65+9\)

\(\Rightarrow x=74\)

Vậy x = 74

b, \(2\left(x-51\right)=2.2^3+20\)

\(2\left(x-51\right)=16+20\)

\(2\left(x-51\right)=36\)

\(x-51=36\div2\)

\(x-51=18\)

\(\Rightarrow x=18+51\)

\(\Rightarrow x=69\)

Vậy x = 69

c, \(2.3^x=162\)

\(\Rightarrow2.3^x=2.3^4\)

\(\Rightarrow3^x=3^4\)

\(\Rightarrow x=4\)

Vậy x = 4