bài 1: tính nhanh
a,15 x 12 + 15 x 4 +15
b, 3 x 125 x 121 x 8
c, 98 x 122 + 264
d, 367 + 129 + 133 + 371 + 17
bài 2: tìm x
a, ( x + 60 ) - 160 = 0
b, 4221 : ( x - 16 ) = 21
c, 7 x x - 7 = 714
d, 4 x x : 13 = 0
e, 0 : x = 0
g, 2448 : [ 119 -(x - 6)] = 24
chỉ cần giải cho mình câu C bài 1 và câu B,C bài 2 thôi nhé
Câu 2. Tìm số tự nhiên x, biết:
a) a) 7x - 8 = 713
b) b) 2448 : [119 - (x - 6)] = 24
c) c) 2016 – 100.(x + 11) = 27 : 23
a,
7x – 8 = 713
7x = 713 + 8
7x = 721
x = 721 : 7
x = 103.
b,
2448:[119-(x-6)]=24
119-(x-6)= 2448 : 24
119-(x-6)= 102
x-6= 119-102
x-6= 17
x=17+6
x=23
c,
2016 - 100.( x +11 ) = 2^7 : 2^3
2016 - 100.(x+11) = 2^4
2016 - 100.(x+11)=16
100.(x+11) = 2016-16
100.(x+11)=2000
x+11=2000:100
x+11=20
x = 20-11
x = 9
1) Tìm x
a) (x+12)-20=0
b) 5.(x-7)=0
c) 12x-3x+1=937
d) 2448 : [ 119 - ( x - 6 ) ] = 24
a) (x+12)-20=0
x+12=20
x=8
b) 5.(x-7)=0
x-7=0
x=7
c) 12x-3x+1=937
12x-3x=936
9x=936
x=104
d) 2448 : [ 119 - ( x - 6 ) ] = 24
119-(x-6) = 102
x-6=17
x=23
a ) ( x + 12 ) - 20 = 0
x + 12 = 0 + 20
x +12 = 20
x = 20 - 12
x = 8
b ) 5 . ( x - 7 ) =0
x - 7 = 0 : 5
x - 7 = 0
x = 0 + 7
x = 7
a) => x+12=0+20=20
=> x=20-12=8
b) =>x-7=0:5=0
=>x=0+7=7
c) => 15x+1=937
=>15x=937-1=936
=> x= 936:15=62,4
d) => 119-(x-6)=2448:24=102
=>x-6=119-102=17
=>x=17+6=23
Chọn mình nha . cảm ơn!!!! chúc bạn học tốt nha
tìm X
a, 2448 : [119-(X-6)]=24
b,(X-21) x 13 : 11=39
a) ( 6400 + 2600) - 3x = 1200
b( 4x - [( 8000 - 3567 ) - ( 2031 - 1598 ) ] = 400
c) 2448 : [( 119 - ( x-6)]= 24
a,(6400+2600)-3x=1200
9000-3x=1200
3x=9000-1200
3x=7800
x=7800:3
x=2600
b,(4x-[(8000-3567)-(2031-1598)]=400
(4x-[4433-433]=400
4x-4000=400
4x=400+4000
4x=4400
x=4400:4
x=1100
C;2448:[(119-(x-6)]=24
119-(x-6)=2448:24
119-(x-6)=102
x-6=119-102
x-6=17
x=17+6
x=23
a. (6400+2600) -3x=1200
=> 9000-3x=1200
=> 3x=9000-1200
=> 3x=7800
=> x=7800:3
=> x=2600
b. {4x-[(8000-3567)-(2031-1598)]}=400
=> { 4x-(4433-433)}=400
=> 4x-4000=400
=> 4x=400+4000
=> 4x=4400
=> x=4400:4
=> x=1100
c. 2448:[(119-(x-6)]=24
=> 119-(x-6)=2448:24
=> 119-(x-6)=102
=> x-6=119-102
=> x-6=17
=> x=17+6
=> x=23
Câu 1: Tìm số tự nhiên x, biết:
a) 7x - 8 =713
b) 2448 : [119 - (x-6)] =24
c)2016 -100.(x+11) = 2^7:2^3
Câu 2:Kết quả phép tính : 879.2+879.996+3.879
Câu 1 :
a) 7x-8=713
7x=713+8
7x=721
x=721:7
x=103
Vậy x=103.
b)2448:[119-(x-6)]=24
119-(x-6)=2448:24
119-(x-6)=102
x-6=119-102
x-6=17
x=17+6
x=23
Vậy x=23.
c) 2016-100(x+11)=27:23
2016-100(x+11)=24=16
100(x+11)=2016-16
100(x+11)=2000
x+11=2000:100
x+11=20
x=20-11
x=9
Vậy x=9.
Câu 2 :
879.2+879.996+3.879=879(2+996+3)
=879.1001
=879879
2448:[119-(x-6)]=24
`2448:[119-(x-6)]=24`
`=>119-(x-6)= 2448 : 24`
`=>119-(x-6)= 102`
`=> x-6=119-102`
`=> x-6=17`
`=>x=17+6`
`=>x=23`
`2448:[119-(x-6)]=24`
`=>119-(x-6)= 2448 : 24`
`=>119-(x-6)= 102`
`=> x-6=119-102`
`=> x-6=17`
`=>x=17+6`
`=>x=23`
2448 : {119- [X - 6] }=24
2448 : 24=102
119-102=17
17+6=23
x=23
2448:[119.(x-6)]=24
\(2448:\left[119.\left(x-6\right)\right]=24\)
\(119.\left(x-6\right)=2448:24=102\)
\(x-6=102:119\)
=> sai de