x+20+20=200+200-10

x+20+20=400-10

x+20+20=390

x+40      =390

            x=390-40

            x=350

chuc bn hoc gioi!

x + 20 + 20 = 200 + 200 - 10

x + 20 + 20 = 390

x + 40 = 390

        x = 390 - 40

        x = 350

500 + 500 = 1 000

100 + 100 = 200

200 + 200 = 400

2 000 x 20 = 40 000

500 + 500 = 1000

100 + 100 = 200

200 + 200 = 400

2000 x 20 = 40000

x + 60 = 200 - 20

x + 60 = 180

        x = 180 - 60

        x = 120

k mik nha

mik k lại

x = 120, k minh nhe, to k lai lan nua duoc ko, chung ta la bn ma

A) 24309080   B) 78520000 C)  15790354

1215454 * 20 = 24309080

78520 * 1000 = 78520000

78951 * 200 + 154 = 15790200 + 154 = 15790354

Hok tốt bạn nhé

= 1000

k nha

bạn

mình k lại cho

20 + 20 + 60 + 100 + 600 + 200 = 1000

k mk nhaTomori Nao

A.200 ạ                                                      

Trả lời:   Câu A.200

Hok tốt !

#Tử Thần

a)\(\left(y-607200\right):305=642+318\)

⇔\(\left(y-607200\right):305=960\)

⇔\(y-607200=292800\)

⇔\(y=900000\)

a)

\(5x+375x+125x=20\)

\(x.\left(5+375+125\right)=20\)

\(405x=20\)

\(x=\frac{20}{405}\)

\(x=\frac{4}{81}\)

Vậy \(x=\frac{4}{81}\)

\(72:24x=45\)

\(3x=45\)

\(x=\frac{45}{3}\)

\(x=15\)

Vậy \(x=15\)

\(915x+285x=48\)

\(x.\left(915+285\right)=48\)

\(1200x=48\)

\(x=\frac{48}{1200}\)

\(x=\frac{1}{25}\)

Vậy \(x=\frac{1}{25}\)

\(\left(3x+4\right):5=8\)

\(3x+4=8.5\)

\(3x=40-4\)

\(3x=36\)

\(x=\frac{36}{3}\)

\(x=12\)

Vậy \(x=12\)

\(\left(15.28-x\right):\frac{2}{5}=200:4\)

\(420-x=50.\frac{5}{2}\)

\(420-x=125\)

\(x=420-125\)

\(x=295\)

Vậy \(x=295\)

Câu b mk thấy số hơi to nên ngại làm.

Dấu "." là dấu nhân b nhé

bạn ơi cho mình hỏi chỗ

x = 20 

405x = 

là 20 x 405 hả bạn

a) (y – 1) : 105 = 125 x 80

(y – 1) : 105 = 10000

(y – 1) = 10000 x 105

(y – 1) = 1050000

y = 1050000 + 1

y = 1050001

b) (y – 607 200) : 305 = 642 + 318

(y – 607 200) : 305 = 960

(y – 607 200) = 960 x 305

(y – 607 200) = 292800

y = 292800 + 607 200

y = 900000

\(a.\left(y-1\right):105=125x80\)                   \(b.\left(y-607200\right):305=642+318\)

\(\left(y-1\right):105=10000\)                             \(\left(y-607200\right):305=960\)

\(y-1=10000x105=1050000\)                \(y=960+607200=608160\)

\(y=1050000+1=1050001\)

\(c.\left(1780-973\right)x\left(75:y\right)=2401+20\)

\(807x\left(75:y\right)=2401+20\)

\(807x\left(75:y\right)=2421\)

\(75:y=2421:807=3\)

\(y=75:3=25\)