456 x 390
Giup mik voi a !
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Có: x-1/2005=3-y/2006
=> x-1+3-y/2005+2006
=> x-y+2/4011(tính chất của tỷ lệ thức)
Mà x-y=4009 nên
x-1/2005=3-y/2006=x-1+3-y/2005+2006=x-y+2/4011=1
=> x-1/2005=1=> x=2006
=> 3-y/2006=1=> y=-2013
\(3x=y\)=> \(\frac{x}{1}=\frac{y}{3}\)
hay \(\frac{x}{4}=\frac{y}{12}\)
\(5y=4z\)=> \(\frac{y}{4}=\frac{z}{5}\)
hay \(\frac{y}{12}=\frac{z}{15}\)
suy ra: \(\frac{x}{4}=\frac{y}{12}=\frac{z}{15}\)
đến đây bạn ADTCDTSBN nhé
123/345+456/678:2
=123/345+38/113
=9003/12995
k cho mình nhé
A)
0,92 × 324 + 0,92 × 678
= 0,92 × (324+678)
= 0,92 × 1002
= 0,92 × 1000 + 0,92 × 2
= 920 + 1,84
= 921,84
a)
{ 2019 - [ -521]} - {202 + 521} + {-456 + 202}
= 2019 + 521 - 202 - 521 + -456 + 202
= 2019 + (521 - 521) + (-202 + 202) + -456
= 2019 + 0 + 0 + -456
= 2019 + -456
= 1563
[2019 - (-521)] - (202 + 521) + (-456 + 202)
= 2019 + 521 - 202 - 521 - 456 + 202
= (2019 - 456) + (521 - 521) - (202 - 202)
= 1563
Có A = 1998 x 2002
= (2000 - 2) x (2000 + 2)
= 20002 - 22
= 20002 - 4
Mà B = 2000 x 2000 = 20002 ; 20002 - 4 < 20002
=> A < B
Có B = 35 x 53 - 18
= (34 + 1) x 53 - 18
= 34 x 53 + 53 - 18
= 34 x 53 + 35
=> B = D
Simplifying 5(2x + 1) = 3(x + -2) Reorder the terms: 5(1 + 2x) = 3(x + -2) (1 * 5 + 2x * 5) = 3(x + -2) (5 + 10x) = 3(x + -2) Reorder the terms: 5 + 10x = 3(-2 + x) 5 + 10x = (-2 * 3 + x * 3) 5 + 10x = (-6 + 3x) Solving 5 + 10x = -6 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 5 + 10x + -3x = -6 + 3x + -3x Combine terms: 10x + -3x = 7x 5 + 7x = -6 + 3x + -3x Combine terms: 3x + -3x = 0 5 + 7x = -6 + 0 5 + 7x = -6 Add '-5' to each side of the equation. 5 + -5 + 7x = -6 + -5 Combine terms: 5 + -5 = 0 0 + 7x = -6 + -5 7x = -6 + -5 Combine terms: -6 + -5 = -11 7x = -11 Divide each side by '7'. x = -1.571428571 Simplifying x = -1.571428571
19,My father used to smoke
20,The cake is cleverly cut by her
21,Ba offered Mai to dance
22,My father told us that he was very happy then
= 177840
HT
177840 nhé . Chúc bạn học tốt