\(3^x:3^2-12=69\)
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\(\left[\left(3^{14}\times69+3^{14}\times12\right):3^{16}-7\right]:2^4\)
\(=\left[3^{14}\left(69+12\right):3^{16}-7\right]:2^4\)
\(=\left[3^{14}.81:3^{16}-7\right]:2^4\)
\(=\left[3^{14}.3^4:3^{16}-7\right]:2^4\)
\(=\left[3^2-7\right]:2^4\)
\(=2:2^4\)
\(=\dfrac{2}{16}=\dfrac{1}{8}\)
\(\left[\left(3^{14}.69+3^{14}.12\right):3^{16}-7\right]:2^4\\ =\left[3^{14}.\left(69+12\right):3^{16}-7\right]:2^4\\ =\left[3^{14}.81:3^{16}-7\right]:2^4\\ =\left[3^{14}.3^4:3^{16}-7\right]:2^4\\ =\left(3^2-7\right):2^4=2:2^4=\dfrac{1}{2^3}=\dfrac{1}{8}\)
P/s : làm từng phần sợ bn ko đợi đc :D
a) ( x - 12 ) x 105 = 0
mà 105 khác 0
=> x - 12 = 0
=> x = 12
b)
2 x x - 69 x 2 = 69 x 4
2 x ( x - 69 ) = 276
x - 69 = 138
x = 207
2 x 18 x 14 + 3 x 17 x 12 + 4 x 69 x 9
=(2 x 18) x 14 + (3 x 12) x 17 + (4 x 9) x 69
=36 x 4 + 36 x 17 + 36 x 69
= 36x( 4+17+69)
=36x100
=3600
Chúc bạn học tốt ^_^
2 x 18 x 14 + 3 x 17 x 12 + 4 x 69 x 9
=(2 x 18) x 14 + (3 x 12) x 17 + (4 x 9) x 69
=36 x 4 + 36 x 17 + 36 x 69
= 36x( 4+17+69)
=36x100+
=3600
2 x 18 x 14 + 3 x 17 x 12 + 4 x 69 x 6
= (2 x 18) x 14 + (3 x 12) x 17 + (4 x 6) x 69
= 36 x (14 + 17 + 69)
= 36 x 100
= 3600
\(2.18.14+3.17.12+4.69.6\)
\(=\left(2.18\right).14+\left(3.12\right).17+\left(4.6\right).69\)
\(=36.14+36.17+24.69\)
\(=36.\left(14+17\right)+24.69\)
\(=36.31+24.69\)
\(=4.9.31+4.6.69\)
\(=4.\left(9.31+6.69\right)\)
\(=4.\left(279+414\right)\)
\(=4.693\)
\(=2772\)
Jennie Kim làm sai từ dòng thứ 3 rồi nha bn
~ Rất vui vì giúp đc bn ~
2x - 12 = 18................................
2x = 30 ........................................
x = 15.....................................
6: =>x=9/10+1/5=9/10+2/10=11/10
7: =>x=3/8-5/12=36/96-40/96=-1/24
8: =>x=7/6-5/4=14/12-15/12=-1/12
9: =>x=1/35+2/7=1/35+10/35=11/35
10: =>x=2/7-7/10=20/70-49/70=-29/70