a.x+126=480
b.x-209= 435
Tìm x
x + 126 = 480
x - 209 = 435
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 + 126 = 480 x - 209 = 435
x = 480-126 x = 435 + 209
x = 354 x = 644
Tìm X
X x 405= 86 265
89 658 : X = 293
X + 126 = 480
X - 209 = 435
X : 13 = 200 + 5
X x 40 = 26 000 - 400
962 456 - X = 342 x 7
\(x\times405=86265\)
\(x=86265:405\)
\(x\text{=}213\)
\(89658:x=293\)
\(x=89658:293\)
\(x\text{=}306\)
\(x+126=480\)
\(x=480-126\)
\(x=354\)
\(x-209\text{=}435\)
\(x\text{=}435+209\)
\(x\text{=}644\)
\(x:13=200+5\)
\(x:13\text{=}205\)
\(x\text{=}205\times13\)
\(x\text{=}2665\)
\(x\times40\text{=}26000-400\)
\(x\times40=25600\)
\(x\text{=}25600:40\)
\(x\text{=}640\)
\(962456-x=342\times7\)
\(962456-x=2394\)
\(x\text{=}962456-2394\)
\(x\text{=}960062\)
Tìm x: x – 209 = 435
Tìm x :
b) x – 209 = 435
chứng minh rằng A.x-A=x^210-1 biết A=1+x+x^2+x^3+...+x^209
giúp mình nha mình đang cần gấp
435 x 85 + 435 x 45 - 435 x 31 + 435 =
Giải lần lượt ra nha
TL:
435 x 85 + 435 x 45 - 435 x 31 + 435
= 435 x 85 + 435 x 45 - 435 x 31 + 435 x 1
= 435 x (85 + 45 - 31 + 1)
= 435 x 100
= 43500
HT
Nhớ t i c k
435 x 85 + 435 x 45 - 435 x 31 + 435
435 x 85 + 435 x 45 - 435 x 31 + 435 x 1
= 435 x ( 85 + 45 - 31 + 1 )
= 435 x 100
= 43500
435 x 25 + 76 x 435 - 435 = ?
435 x 25 + 76 x 435 - 435
= 435 x 25 + 76 x 435 - 435 x 1
= 435 x ( 25 + 76 - 1 )
= 435 x 100
= 43500
ai k mk mk k lai
435x25+76x435-435
=(25+76)x435-435
=101x435-435
=43935-435
=43500
= 435 x 25 + 76 x 435 - 435 x 1
= 435 x (25 + 76 - 1)
= 435 x 100
= 43 500
435+1000+( -435) + ( -100)
435 - 167 - 89 - 435 - 89
\(435-167-89-435-89\\=(435-435)-(167+89+89)\\=-(256+89)\\=-345\)