1000 - 345 + 345 : y
y : 2 x 5 +1234=2234
1234 + 1234 +1234 * 3 =
12 345 - 7 000 - 5 345 =
2 * ( 5678 * 2+5678*3 + 5678 * 5 ) =
trình bày cách làm nhé ! ai nhanh mk tick
1234 + 1234 + 1234 x 3 =1234 x 5 = 6170
12345 - 7000 - 5345 = 12345 - (7000 + 5345) = 12345 - 12345 = 0
2 x ( 5678 x 2 + 5678 x 3 + 5678 x 5) = 2 x ( 5678 x 10 ) = 2 x 56780 = 113560
k mình nhe !
1.Tính hợp lí:
a)-[-345+1234-2014]-(345-1234)
b)(-31).47+(-31).52+(-31)
c)654+{374-[654-(+126)]
d)24.(16-5)-16.(24-5)
2.Tìm x;y ∈ Z biết
|x-8|+|y+2|=2
1.
a) -[ -345 + 1234 - 2014] - (345 - 1234)
= 345 - 1234 + 2014 - 345 + 1234
= ( 345 - 345) + ( -1234 +1234) +2014
= 0 + 0 + 2014 = 2014
b) ( -31) . 47 + ( -31) . 52 + ( -31)
= (-31) . ( 47 + 52 +1)
= (-31) . 100 = -3100
c) 654 +{ 374 - [ 654 - ( +126)]}
= 654 + [ 374 -( 654 - 126)]
= 654 + ( 374 - 654 + 126)
= 654 + 374 - 654 + 126
= ( 654 - 654 ) + ( 374 + 126 )
= 0 + 500 = 500
a) -[ -345 + 1234 - 2014] - (345 - 1234)
= 345 - 1234 + 2014 - 345 + 1234
= ( 345 - 345) + ( -1234 +1234) +2014
= 0 + 0 + 2014 = 2014
b) ( -31) . 47 + ( -31) . 52 + ( -31)
= (-31) . ( 47 + 52 +1)
= (-31) . 100 = -3100
c) 654 +{ 374 - [ 654 - ( +126)]}
= 654 + [ 374 -( 654 - 126)]
= 654 + ( 374 - 654 + 126)
= 654 + 374 - 654 + 126
= ( 654 - 654 ) + ( 374 + 126 )
= 0 + 500 = 500
a) -[ -345 + 1234 - 2014] - (345 - 1234)
= 345 - 1234 + 2014 - 345 + 1234
= ( 345 - 345) + ( -1234 +1234) +2014
= 0 + 0 + 2014 = 2014
b) ( -31) . 47 + ( -31) . 52 + ( -31)
= (-31) . ( 47 + 52 +1)
= (-31) . 100 = -3100
c) 654 +{ 374 - [ 654 - ( +126)]}
= 654 + [ 374 -( 654 - 126)]
= 654 + ( 374 - 654 + 126)
= 654 + 374 - 654 + 126
= ( 654 - 654 ) + ( 374 + 126 )
= 0 + 500 = 500
tick và theo dõi giúp mình nha
1000 - 345 + 345 : y = 655 + 345 : 5
\(1000 − 345 + 345 : y = 655 + 345 : 5\)
\(655 + 345 : y = 655 + 69\)
\(345 : y = 655 + 69 − 655\)
\(345 : y = ( 655 − 655 ) + 69\)
\(345 : y = 0 + 69\)
\(y = 345 : 69\)
\(y = 5\)
`#Ya`
cau 5 : tim y biet : 1000 - 345 + 345 : y = 655 + 345 : 5
1000-345+345:y=655+345:5
1000-345+345:y=724
345+345:y=1000-724
345:y=276-345
y=345-131
y=214
123 x 45 - 345 + 1234 = ?
123 x 45 - 345 + 1234
= 5535 - 345 +1234
= 5190 + 1234
= 6424
\(123\times45-345+1234\)
\(=492-345+1234\)
\(=147+1234\)
\(=1381\)
123 x 45 - 345 + 1234
=5535 -345 + 1234
=5190 + 1234
=6424
hok tốt .
109 - 43 + 6772 + 90 - 1123 + 723 - 87 + 1086 + 345 - 2234 - 809 = ?
Nhanh thì mình tick nha!
\(\text{109 - 43 + 6772 + 90 - 1123 + 723 - 87 + 1086 + 345 - 2234 - 809 }\)
\(=4829\)
hok tốt
@@
- ( 354+1234-2014) - (345-1234)
- 354 + 1234 - 2014 - 354 + 1234
= ( - 354 + 354 ) + ( 1234 - 1234 ) + 2014
= 2014
Nếu sai thì thôi đúng thì chọn đúng
- 354 + 1234 - 2014 - 354 + 1234
= ( - 354 + 354 ) + ( 1234 - 1234 ) + 2014
= 2014
Ta có:
\(-\left(354+1234-2014\right)-\left(345-1234\right)\)
\(=-354-1234+2014-345+1234\)
\(=\left(-354-345\right)+\left(-1234+1234\right)+2014\)
\(=-699+2014=1315\)
Chúc em học tốt!!!!!!
tìm x
x : 2 x 5 + 1234 = 2234
giúp mik ai đúng mik k
\(x:2\times5+1234=2234\)
\(x:2\times5=2234-1234\)
\(x:2\times5=1000\)
\(x:2=1000:5\)
\(x:2=200\)
\(x=200\times2\)
\(x=400\)
@muối
x=400
x : 2 x 5 + 1.234 = 2.234
x : 2 x 5 = 2.234 - 1.234
x : 2 x 5 = 1.000
x : 2 = 1.000 : 5
x : 2 = 200
x = 200 x 2
x = 400
Chúc bạn học tốt.
😁😁😁
Tìm y
a/ y*(233+327)=327*99+99*233
b/ 1000-345+345:y=655+345/5
1000-345+345:y= 655 +345 :5