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a.17 . 85 + 25 . 17 + 1200
=17.(85+25)+1200
=17.110+1200
=1870+1200
=3070
b.62 : 4 . 3 + 2 . 52
=36:4.3+2.25
=27+50
=77
c.5 . 42 - 18 : 32
=5.16-18:9
=80-2
=78
d.3 . 52 - 16 : 23 + 34 : 33
=3.25-16:8+3
=75-2+3
=76
e.220 - [ 32 . 33 - ( 12 - 70 ) 2]
=220-35+112
=220-243+121
=98
j. 49 . 73 + 49 . 51 - 49 . 24
=49.(73+51-24)
=49.100
=4900
Con bấm mỏi suốt đấy mấy má
nhầm
a) 17 . 85 + 25 . 17 + 1200
=(17.85+25.17)+1200
=17(85+25)+1200
=17.110+1200
=1870+1200
=3070
b) 62 : 4 . 3 + 2 . 52
=36:4.3+2.25
=9.3+50
=27+50
=77
c) 5 . 42 - 18 : 32
=5.16-18:9
=80-2
=78
d) 3 . 52 - 16 : 23 + 34 : 33
=3.25-24:23+3(4-3)
=75-2(4-3)+31
=75-21+3
=75-2+3
=76
e) 220 - [ 32 . 33 - ( 12 - 70 ) 2 ]
=220-[3(2+3)-(12-1)2]
=220-(35-112)
=220-(243-121)
=220-122
=98
j) 49 . 73 + 49 . 51 - 49 . 24
=49(73+51-24)
=49.100
=4900
25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))25-( 49- ( 23.17-23.14))
3.|x+1|-2=4
3.|x+1|=4+2
3.|x+1|=6
|x+1|=6:3
|x+1|=2
Trường hợp 1 x+1=2
x=2-1
x=1
trường hợp 2
x+1=-2
x=(-2)-1
x=-3
==> x thuộc {1; -3}
k mk nha chúc học tốt
a ) 25 - [ 49 - ( 23 . 17 - 23 . 14 ) ]
= 25 - { 49 - [ 23 ( 17 - 14 ) ]
= 25 - [ 49 - ( 23 . 3 ) ]
= 25 - ( 49 - 24 )
= 25 - ( 49 - 16 )
= 25 - 33
= - 8
a) \(5^4:\left(2x-1\right)^2=25\\ \Leftrightarrow5^4:\left(2x-1\right)^2=5^2\\ \Leftrightarrow5^4:5^2=\left(2x-1\right)^2\\ \Leftrightarrow\left[{}\begin{matrix}\left(2x-1\right)^2=5^2\\\left(2x-1\right)^2=\left(-5\right)^2\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}2x-1=5\\2x-1=-5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-2\end{matrix}\right.\)
b) \(17^3.x=17^4\\ \Rightarrow x=17^4:17^3=17\)
c) \(\left(2x+1\right)^3:49=7\\ \Leftrightarrow\left(2x-1\right)^3:7^2=7\\ \Leftrightarrow\left(2x-1\right)^3=7.7^2=7^3\\ \Leftrightarrow2x-1=7\\ \Leftrightarrow x=4\)
a)54 : (2x - 1)2 =25
54 : (2x - 1)2 =52
(2x - 1)2 =54 : 52
(2x - 1)2 = 52
2x - 1 = 5
2x = 5+1
2x = 6
x = 6: 2
x = 3
b)173.x = 174
x = 174 : 173
x = 17
c)(2x + 1)3 : 49 =7
(2x + 1)3 = 7 . 49
(2x + 1)3 = 343
(2x + 1)3 = 73
2x +1 = 7
2x = 7- 1
2x = 6
x = 6:2
x = 3
17 - (2 - 49) - 23 . 22
= 17 - (-47) - 25
= 17 + 47 - 32
= 64 - 32
= 32
#Học tốt!!!
~NTTH~
17-(2-49)-8 .4
=17-(-47)-8.4
=17-(-47)-32
=64-32
=32