x = 354

a) x = 354

X + 126 = 480

\(\Rightarrow\)X = 480 - 126 = 354

X - 209 = 435

\(\Rightarrow\)X = 435 + 209 = 644

\(x+126=480\)

\(x=354\)

\(x-209=435\)

\(x=644\)

\(x\times405=86265\)

\(x=86265:405\)

\(x\text{=}213\)

\(89658:x=293\)

\(x=89658:293\)

\(x\text{=}306\)

\(x+126=480\)

\(x=480-126\)

\(x=354\)

\(x-209\text{=}435\)

\(x\text{=}435+209\)

\(x\text{=}644\)

\(x:13=200+5\)

\(x:13\text{=}205\)

\(x\text{=}205\times13\)

\(x\text{=}2665\)

\(x\times40\text{=}26000-400\)

\(x\times40=25600\)

\(x\text{=}25600:40\)

\(x\text{=}640\)

\(962456-x=342\times7\)

\(962456-x=2394\)

\(x\text{=}962456-2394\)

\(x\text{=}960062\)

a: x= 480 - 126

x = 354

b: x - 209 =435

x = 435 + 209

x = 644

ĐÁP SỐ: A=354, B=644

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a ) x = 480 - 126 

x = 354

b ) x = 435 + 209

x = 644

y + 126 = 480 x 12

y + 126 = 5760

y = 5760 - 126

y = 5634

Các bạn ủng hộ cho mik nha !!!

y+126=480*12

y+126=5760

y=5760-126

y=5634

126 x 183 - 126 x 83 

= 126 x ( 183 - 83 )

= 126 x 100 

= 12600

126 x 183 - 126 x 83

= 126 x ( 183 - 83 )

= 126 x 100

= 12600

480 ÷ x - 120 ÷ x = 60

(480 - 120) ÷ x = 60

360 ÷ x = 60

x = 360 ÷ 60

x = 6

480 : x-120:x=60

(480-120):x=60

360:x=60

       x=360:60

       x=6

x x 480 = 960

      x = 960 : 480 

     x = 2

\(x\times480=960\)

             \(x=960:480\)

              \(x=2\)

Vậy x = 2