Tính nhanh
a) (x-34).19=0
b) 18(x-16)=18
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a: \(32684+41325+316+675\)
\(=\left(32684+316\right)+\left(41325+675\right)\)
\(=33000+42000=75000\)
b: \(25\cdot18\cdot4\cdot2\)
\(=18\cdot2\cdot\left(25\cdot4\right)\)
\(=36\cdot100=3600\)
c: \(19\cdot81+19+18\cdot19\)
\(=19\left(81+1+18\right)\)
\(=19\cdot100=1900\)
A, 32684 + 41325 + 316 + 675
=(32684+316)+(41325+675)
=33000+42000
=75000
B, 25 x 18 x 4 x 2
=(25x4)x(18x2)
=100x36
=3600
C, 19 x 81 + 19 + 18 x 19
=19x(81+18+1)
=19x100
=1900
11 x 12 + 12 x 13 + 13 x 14 + 14 x 15 + 15 x 16 + 16 x 17 + 17 x 18 + 18 x 19 + 19 x 20 + 20 x 21
= 12 x ( 11 + 13 ) + 14 x ( 13 + 15 ) + 16 x ( 15 + 17 ) + 18 x ( 17 + 19 ) + 20 x 21
= 12 x 24 + 14 x 28 + 16 x 32 + 18 x 36 + 420
= 288 + 392 + 512 + 648 + 420
= ( 288 + 392 ) + ( 512 + 648 ) + 420
= 680 + 1160 + 420
= 1840 + 420
= 2260
tk nha
=
Ta có:
11 x 12 + 12 x 13 + 13 x 14 + 14 x 15 + 15 x 16 + 16 x 17 + 17 x 18 + 18 x 19 + 19 x 20 + 20 x 21
= 12 x ( 11 + 13 ) + 14 x ( 13 + 15 ) + 16 x ( 15 + 17 ) + 18 x ( 17 + 19 ) + 20 x 21
= 12 x 24 + 14 x 28 + 16 x 32 + 18 x 36 + 420
= 288 + 392 + 512 + 648 + 420
= ( 288 + 392 ) + ( 512 + 648 ) + 420
= 680 + 1160 + 420
= 1840 + 420
= 2260
#Mạt Mạt#
a) \(\dfrac{25}{37}\times\dfrac{18}{29}+\dfrac{18}{29}\times\dfrac{12}{37}\)
\(=\dfrac{18}{29}\times\left(\dfrac{25}{37}+\dfrac{12}{37}\right)\)
\(=\dfrac{18}{29}\times\dfrac{37}{37}\)
\(=\dfrac{18}{29}\times1\)
\(=\dfrac{18}{29}\)
b) \(\dfrac{31}{85}\times\dfrac{11}{19}+\dfrac{31}{85}\times\dfrac{12}{19}-\dfrac{42}{19}\times\dfrac{31}{85}\)
\(=\dfrac{31}{85}\times\left(\dfrac{11}{19}+\dfrac{12}{19}-\dfrac{42}{19}\right)\)
\(=\dfrac{31}{85}\times\dfrac{-19}{19}\)
\(=\dfrac{31}{85}\times-1\)
\(=-\dfrac{31}{85}\)
c) \(\dfrac{16}{53}:\dfrac{17}{9}-\dfrac{16}{53}:\dfrac{17}{8}\)
\(=\dfrac{16}{53}:\left(\dfrac{9}{17}-\dfrac{8}{17}\right)\)
\(=\dfrac{16}{53}:\dfrac{1}{17}\)
\(=\dfrac{16}{901}\)
c) \(\dfrac{1}{5}\times\dfrac{12}{31}\times\dfrac{4}{3}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\dfrac{12}{31}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\left(\dfrac{12}{31}+\dfrac{19}{31}\right)\)
\(=\dfrac{4}{15}\times\dfrac{31}{31}\)
\(=\dfrac{4}{15}\times1\)
\(=\dfrac{4}{15}\)
a: =18/29*(25/37+12/37)
=18/29
b: =31/85(11/19+12/19-42/19)
=-31/85
c; =16/53(9/17+8/17)=16/53
d: =4/15(12/31+19/31)=4/15
(x-34).15=0
=>x-34=0
x=0+34
x=34
18.(x-16)=18
x-16=18:18
x-16=1
x=1+16
x=17
( x - 34 ) . 15 = 0
x - 34 = 0 ; 15 ( coi x - 34 là thừa số )
x - 34 = 0
x = 0 + 34
x = 34
18. ( x - 16 ) = 18
x - 16 =18 : 18
x - 16 = 1
x = 16 + 1
x = 17
(x-34).15=0
x-34 =0.15
x-34 =0
x =0+34=34
18.(x-16)=18
x-16 =18:18
x-16 =1
x =1+16=17
(x-34).15 = 0
=> x-34 = 0:15 = 0
=> x = 0+34
=> x = 34
18.(x-16) = 18
=> x - 16 = 18 : 18 = 1
=> x = 1 + 16
=> x = 17
=>(x-34)=0:15 ko tồn tại
=>(x-16)=1
=>x=17
đúng 100%
tham khảo nha
( x - 34 ) . 15 = 0
x - 34 = 0
x = 34
18 . ( x - 16 ) = 18
x - 16 = 1
x = 17
Study well
a) (x - 34) . 15 = 0 b) 18 . (x - 16) = 18
x - 34 = 0 : 15 x - 16 = 18 : 18
x - 34 = 0 x - 16 = 1
x = 0 + 34 x = 1 + 16
x = 34 x = 17
Vậy x = 34 Vậy x = 17
a,(x-34).15=0
(x-34)=0
x=34
Vậy x=34
b, 18.(x-16)=18
x-16=1
x=17
Vậy x=17
15 - ( 13 + x) = x- ( 23 - 17 )
15-13-x=x-23+17
2x=(-15)+(-13)-23+17
2x=(-28)-23+17
2x=(-51)+17
2x=(-34)
x=(-34):2
x=(-17)
k cho mk nha
HT
a) (x - 34). 19 = 0
x - 34 = 0 : 19
x - 34 = 0
x = 0 + 34
x = 34
b) 18(x - 16) = 18
x - 16 = 18 - 18
x - 16 = 0
x = 0 + 16
x = 16