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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
\(\left(3^4.57-9^2.21\right):3^5\)
\(=\left(81.57-81.21\right):243\)
\(=\left(81\left(57-21\right)\right):243\)
\(=\left(81.36\right):243\)
\(=2916:243\)
\(=12\)
(34 . 57 - 92 . 21): 35
= (34 . 57- 34 .21): 35
= 34 . (57 - 21) : 35
= 2916 : 35
= 12
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
\(\left(3^4\cdot57-9^2\cdot21\right):3^5\)
\(=\)\(\left(3^4\cdot57-\left(3^2\right)^2\cdot21\right):3^5\)
\(=\)\(\left(3^4\cdot57-3^4\cdot21\right):3^5\)
\(=\)\(\left(3^4\cdot\left(57-21\right)\right):3^5\)
\(=\)\(\left(81\cdot36\right):243\)
\(=\)\(2916:243\)
\(=\)\(12\)
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, \(50-\left[50-\left(2^3.5\right)\div2+3\right]\)
\(=50-\left[50-8.5\div2+3\right]\)
\(=50-\left[50-40\div2+3\right]\)
\(=50-\left[50-20+3\right]\)
\(=50-\left[30+3\right]\)
\(=50-33=17\)
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