a.(x + 125) : 312 = 14 (dư 300)
x+125 = 14 x 312 + 300
x+125 = 4 668
x= 4 668 - 125
x=4 543
b.(x-234):23=128 (dư 21)
x-234=128 x 23 + 21
x-234=2 965
x=2 965 + 234
x=3 199
c.(x-24) x 2020=2020x33
(x-24)x2020=66 660
x-24=66 660:2020
x-24=33
x=33+24
x=57
d.5 x (x+2019)=3800 x 5
5 x (x+2019)=19 000
x+2019=19000:5
x+2019=3800
x=3800-2019
x=1 781
HẾT=)))
tìm y biết :
a) (x + 125) : 312 = 14 (dư 300)
b) (x – 234) : 23 = 128 (dư 21)
c) (x - 24) x 2020 = 2020 x 33
d) 5 x (x + 2019) = 3800 x 5
a) 2019/2020 x 4/11 + 2019/2020 x 5/11 + 2019/2020 x 2/11
b) 17/14 x 25/27 - 1/14 x 25/27 - 2/14 x 25/27
Tìm y biết:
a) y x 4 + y x 6 = 240
b) y x 22 + y x 78 = 4200
c) y x 6 – y x 2 = 2844
d) y x 286 – y x 186 = 21900
e) 166 : y + 34 : y =10
g) 2125 : y – 125 : y = 80
h) (y + 5) x 2020 = (200 + 5) x 2020
i) y - 45600 = (2019 - 419) x 4 x 25
Tìm y biết:
a) y x 4 + y x 6 = 240
b) y x 22 + y x 78 = 4200
c) y x 6 – y x 2 = 2844
d) y x 286 – y x 186 = 21900
e) 166 : y + 34 : y =10
g) 2125 : y – 125 : y = 80
h) (y + 5) x 2020 = (200 + 5) x 2020
i) y - 45600 = (2019 - 419) x 4 x 25
Tìm y biết:
a) y x 4 + y x 6 = 240
b) y x 22 + y x 78 = 4200
c) y x 6 – y x 2 = 2844
d) y x 286 – y x 186 = 21900
e) 166 : y + 34 : y =10
g) 2125 : y – 125 : y = 80
h) (y + 5) x 2020 = (200 + 5) x 2020
i) y - 45600 = (2019 - 419) x 4 x 25
tìm y:
a) (y + 5) x 2020 = (200 + 5) x 2020
b) y - 45600 = (2019 - 419) x 4 x 25
a) (1 - 1/2) x (1 - 1/3) x (1 - 1/4) x (1 - 1/5) x (1 - 1/6)
b) (1 - 1/2) x (1 - 1/4)x...x (1 - 1/2019) x (1 - 1/2020)
Bài 4 tìm x
a ) X 36 = 972
b ) ( X - 47 ) x 21 = 840
c ) X x 22 + X x 50 = 504
d ) 254 : x = 14 ( dư 16 )
e ) 729 : X = 81
f ) y x 15 + y x 13 = 560 x 45
giúp em với !
Chữ số tận cùng của hiệu sau là chữ số nào ?
A = 1 x 2 x 3 x ... x 2019 x 2020 - 1 x 3 x 5 x ... x 2017 x 2019
GIÚP MÌNH VỚI !!!!!!!!!!!!!