a) 5 x (4 + 6 x X) = 290 b) X x 3,7 + X x 6,3 = 120 c) (15 x 24 – X) : 0,25 = 100 : 1/4 d) 128 x X – 12 x X – 16 x X = 5208000 e) 5 x X + 3,75 x X + 1,25 x X = 20 g) (84,6 – 2 x X) : 3,02 = 5,1

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Đáp án + Giải thích các bước giải :

`a)` `5xx(4+6xx x)=290`

`4+6xx x = 290:5`

`4+6xx x=58`

`6xx x=58-4`

`6xx x= 54`

`x=54:6`

`x=9` 

Vậy `x=9`

`b)` `x xx 3,7 + x xx 6,3=120`

`x xx(3,7+6,3)=120`

`x xx 10 = 120`

`x=120:10`

`x=12`

Vậy `x=12`

`c)` `(15xx24-x):0,25=100:1/4`

`(15xx24-x):0,25=100:0,25`

`(360-x):0,25=100:0,25`

`360-x=100:0,25xx0,25`

`360-x=100`

`x=360-100`

`x=260`

Vậy `x=260`

`d)` `128xx x -12 xx x -16 xx x = 5208000`

`x xx (128-12-16)=5208000`

`x xx 100=5208000`

`x =5208000:100`

`x=52080`

Vậy `x=52080`

`e)` `5 xx x + 3,75 xx x + 1,25 xx x = 20`

`x xx (5+3,75+1,25)=20`

`x xx 10 =20 `

`x=20:10`

`x=2`

Vậy `x=2`

`g)` `(84,6-2 xx x) :3,02=5,1`

`84,6-2 xx x=5,1xx3,02`

`84,6 - 2xx x=15,402`

`2xx x=84,6-15,402`

`2xx x=69,198`

`x=69,198:2`

`x=34,599`

Vậy `x=34,599`

Đáp án+Giải thích các bước giải:

a) $5 × (4+6×x)=290$

$(4+6 ×x )=290:5$

$4+6×x=58$

$6×x=58-4$

$6×x=54$

$x=54:6$

$x=9$

b) $x×3,7+x×6,3=120$

$x×(3,7+6,3)=120$

$x×10=120$

$x=120:10$

$x=12$

c) $(15 x 24 – X) : 0,25 = 100 : 1/4$

$(260-x):0,25=400$

$(260-x)=400×0,25$

$260-x=100$

$x=260-100$

$x=160$

d) $128×x-12×x-16×x=5 208 000$

$(128-12-16)×x=5 208 000$

$100×x=5 208 000$

$x=5 208 000:100$

$x=52 080$

e) $5× x+3,75×x+1,25× x=20$

$x×(5+3,75+1,25)=20$

$x × 10=20$

$x=20:10$

$x=2$

g) $(84,6-2×x)÷3,02=5,1$

$84,6-2×x=5,1x3,02$

$84,6-2×x=15,402$

$2×x=84,6-15,402$

$2×x=69,198$

$x=69,198:2$

$x=34,599$

$#VIT$