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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
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\text{2459 - (400 + 459)}\)
\(\text{= 2459 - 859}\)
\(\text{= 1600}\)
b) \(435\times25+76\times435-435\)
\(=435\times\left(25+76-1\right)\)
\(=435\times100\)
\(=43500\)
c) \(35\times49+51\times36\)
\(=35\times49+51\times\left(35+1\right)\)
\(=35\times49+51\times35+51\)
\(=35\times\left(49+51\right)+51\)
\(=35\times100+51\)
\(=3500+51\)
\(=3551\)
a) 2459 - (400 + 459)
= 2459 - 400 - 459
= (2459 - 459) - 400
= 2400 - 400
= 2000
b) 435 x 25 + 76 x 435 - 435
= 435 x (25 + 76 - 1)
= 435 x 100
= 43500
c) 35 x 49 + 51 x 36
= 1715 + 1836
= 3551
![](https://rs.olm.vn/images/avt/0.png?1311)
x - 345 + 435 + 868 = 1235
x - ( 345 - 435 - 868 ) = 1235
x - ( - 958 ) = 1235
x + 958 = 1235
x = 1235 - 958
x = 277
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2459 - ( 400 + 459 )
= ( 2459 - 459 ) - 400
= 2000 - 400
= 1600
b) 435 x 25 + 75 x 435
= 435 x ( 75 + 25 )
= 435 x 100
= 43 500
c) 35 x 49 + 51 x 35
= 35 x ( 49 + 51 )
= 35 x 100
= 3500
![](https://rs.olm.vn/images/avt/0.png?1311)
(435+125-60) : x = 5
500 : x = 5
x = 500 : 5 = 100
k mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
435 : x + 125 : x - 60 : x = 5
(435+125-60) : x = 5
500 : x = 5
x = 500 : 5
x = 100
435 : x + 125 : x - 60 : x = 5
( 435 + 125 - 60 ) : x = 5
500 : x = 5
x = 500 : 5
x = 100
![](https://rs.olm.vn/images/avt/0.png?1311)
Đặt tính rồi tính :
a. 38615 + 26076 = 64691
b. 726 48 – 52 936 = 19712
c. 263 x 25 = 6575
d. 5176 : 35 = 147,885714286
Câu 2 : Tìm x
X + 2346 = 51430
X = 51430 - 2346
X = 49084
Câu 3. Tổng số tuổi của hai mẹ con là 46 tuổi. Mẹ hơn con 28 tuổi. Hỏi con bao nhiêu tuổi, mẹ bao nhiêu tuổi ?
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 4 x 76 + 76 x 7
= (4 + 7) x 76
= 11 x 76
= 836
b) 4 x 54 + 54 x 2 + 5 x 54
= (4 + 4 + 5) x 54
= 13 x 54
= 702
c) 37 + 3 x 37 + 5 x 37 + 2 x 37
= 37 x (3 + 5 + 2)
= 37 x 10
= 370
a) 4 x 76 + 76 x 7
= (4 + 7) x 76
= 11 x 76
= 836
b) 4 x 54 + 54 x 2 + 5 x 54
= (4 + 4 + 5) x 54
= 13 x 54
= 702
c) 37 + 3 x 37 + 5 x 37 + 2 x 37
= 37 x (3 + 5 + 2)
= 37 x 10
= 370
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x\times405=86265\)
\(x=86265:405\)
\(x\text{=}213\)
\(89658:x=293\)
\(x=89658:293\)
\(x\text{=}306\)
\(x+126=480\)
\(x=480-126\)
\(x=354\)
\(x-209\text{=}435\)
\(x\text{=}435+209\)
\(x\text{=}644\)
\(x:13=200+5\)
\(x:13\text{=}205\)
\(x\text{=}205\times13\)
\(x\text{=}2665\)
\(x\times40\text{=}26000-400\)
\(x\times40=25600\)
\(x\text{=}25600:40\)
\(x\text{=}640\)
\(962456-x=342\times7\)
\(962456-x=2394\)
\(x\text{=}962456-2394\)
\(x\text{=}960062\)
5 x X=4000-15=3985
x=3985:5
x=797
_____________________________
(X-435):76=868
X-435=868x76
X-435=65968
x=65968+435
x=66403
y′=3x2−6m2xy'\left(1\right)=3-6m^2y′(1)=3−6m2Tiếp tuyến song song d khi:3-6m^2=-3\Rightarrow\left[{}\begin{matrix}m=1\\m=-1\end{matrix}\right.3−6m2=−3⇒[m=1m=−1Với m=1m=1 tiếp tuyến có dạng: y=-3\left(x-1\right)-3=-3xy=−3(x−1)−3=−3x trùng d (ktm)Với m=-1m=−1 tiếp tuyến có dạng: y=-3\left(x-1\right)-1=3x+2y=−3(x−1)−1=3x+2 thỏa mãnVậy B là đáp án... ok chưa mng