10 x 76 + 10 x 24 =
89 x 5 + 11 x 5 =
6-10 x 76 +5 x 11 x12 +4 x14 x15 - 230
6-10x76+5x11x12+4x14x15-230
=6-760+660+840-230
= -754+660+840-230
= -94+840-230
=746-230
=516
bài 1 : 101 x 125 + 101 x 25 - 101 x 50
bài 2 : 76 x 115 + 56 x 24 + 59 x 24
bài 3 : thực hiện phép tính : a ) 90-84+ 8 - 72 +66-60+54-48
b ) 99-97+95-93+91-89+.........+7-5+3-1
bài 4 : tìm số tự nhiên x biết :
a) \(x\) x 16 -\(x\) x 9 = 56
bài 5 :tìm số tự nhiên x , biết
a) \(x\) + 2 x \(x\) +3 x \(x\)+4 x \(x\) +5 x \(x\) = 165
b ) 1+2+3+4+.....+\(x\)=55
GIẢI GIÚP E Ạ
Bài 1:
\(101\cdot125+101\cdot25-101\cdot50\)
\(=101\cdot\left(125+25-50\right)\)
\(=101\cdot100\)
\(=10100\)
Bài 2:
\(76\cdot115+56\cdot24+59\cdot24\)
\(=76\cdot115+24\cdot\left(56+59\right)\)
\(=76\cdot115+24\cdot115\)
\(=115\cdot\left(76+24\right)\)
\(=115\cdot100\)
\(=11500\)
5:
a: =>15x=165
=>x=11
b: =>x(x+1)/2=55
=>x^2+x=110
=>x=10
4: =>7x=56
=>x=8
Bài 1:
101•125+101•25+101•50
= 101•(125+25-50)
=101•100
=10100
Bài 2:
76•115+56•24+59•24
= 76•115+24•(56+59)
= 76•115+24•115
= 115•(76+24)
= 115•100
= 11500
7/11 +3/4 +4/11 +1/4
0.8 x X =1.2 x 10
X - 3/5 = 1/10
8.75 x X + 1.25 =20
4/X = 1/5
6+X/33 =7/11
các bn giúp mik nhé
a) =(7/11+4/11)+(3/4+1/4) b)=>4/5x=12 c)=>x-6/10=1/10 d)tự làm e)=>4/x=4/20 f)=>198/33+x/33=21/33
=1+1 x=12.5/4 x=1/10+6/10 =>x=20 =>x=21-198
=2 x=15 x=7/10 =>x=-177
Bài 142: Tính bằng cách hợp lí
1) 112 x 5 x 2. 2)2 x 247 x5
3) 2 x 4 x 3 x 5. 4) 20 x 7 x 5 x 8
5) 25 x 35 x 4. 6) 47 x 7 + 47 x3
7)5 x 7 x 9 x 2. 8)125 x 9 x 7 x 8
9) 4 x 97 x 25. 10) 8 x 9 10
11) 240 x 24 + 240 x 24. 12) 27 x 2 + 27 x 3 + 27 x 5
13) 48 x 4 + 48 x 3 + 48 x 2 + 48. 14) 247 x 36 + 247 x 64
15)76 x6 + 76 x 4. 16)249 x 101 - 249
TL :
1) 112 x 5 x 2
= 112 x 10
=1120
2) 2 x 247 x 5
= 247 x 10
= 2470
3) 2 x 4 x 3 x 5
= 12 x 10
= 120
4) 20 x 7 x 5 x 8
= 100 x 56
= 5600
5) 25 x 35 x 4
= 100 x 35
= 3500
6) 47 x 7 + 47 x 3
= 47 x ( 7 + 3 )
= 47 x 10
= 470
7) 5 x 7 x 9 x 2
= 10 x 63
= 630
8) 125 x 9 x 7 x 8
= 1000 x 63
= 63000
9) 4 x 97 x 25
= 100 x 97
= 9700
10) 8 x 9 x 10 ( chắc thế )
= 80 x 9
= 720
11) 240 x 24 + 240 x 24
= 24 x ( 240 + 240 )
= 24 x 480
= 11520
12) 27 x 2 + 27 x 3 + 27 x 5
= 27 x ( 2 + 3 + 5 )
= 27 x 10
= 270
13) 48 x 4 + 48 x 3 + 48 x 2 + 48
= 48 x 4 + 48 x 3 + 48 x 2 + 48 x 1
= 48 x ( 4 + 3 + 2 + 1 )
= 48 x 10
= 480
14) 247 x 36 + 247 x 64
= 247 x ( 36 + 64 )
= 247 x 100
= 24700
15) 76 x 6 + 76 x 4
= 76 x ( 6 + 4 )
= 76 x 10
= 760
16) 249 x 101 - 249
= 249 x 101 - 249 x 1
= 249 x ( 101 - 1 )
= 249 x 100
= 24900
Mong các ban cho tui 10 cái T I C K
~HT~
Tìm x
a) 1/2 : 3 + x = 14/5
b) 8/5 : x : 7/4 = 11/6
c) 24/10 + x : 3/4 = 11/3
\(a.\dfrac{1}{2}:3+x=\dfrac{14}{5}\)
\(\dfrac{1}{6}+x=\dfrac{14}{5}\)
\(=>x=\dfrac{79}{30}\)
\(b.\dfrac{8}{5}:x:\dfrac{7}{4}=\dfrac{11}{6}\)
\(\left(\dfrac{8}{5}\cdot\dfrac{4}{7}\right):x=\dfrac{11}{6}\)
\(\dfrac{32}{35}:x=\dfrac{11}{6}\)
\(x=\dfrac{192}{385}\)
\(c.\dfrac{24}{10}+x:\dfrac{3}{4}=\dfrac{11}{3}\)
\(x:\dfrac{3}{4}=\dfrac{11}{3}-\dfrac{24}{10}\)
\(x:\dfrac{3}{4}=\dfrac{38}{30}\)
\(=>x=\dfrac{19}{20}\)
\(a,\dfrac{1}{2}:3+x=\dfrac{14}{5}\\ \Leftrightarrow x+\dfrac{1}{6}=\dfrac{14}{5}\\ \Leftrightarrow x=\dfrac{79}{30}\\ b,\dfrac{8}{5}:x:\dfrac{7}{4}=\dfrac{11}{6}\\ \Leftrightarrow x=\dfrac{192}{385}\\ c,\dfrac{24}{10}+x:\dfrac{3}{4}=\dfrac{11}{3}\\ \Leftrightarrow\dfrac{4}{3}x=\dfrac{19}{15}\\ \Leftrightarrow x=\dfrac{19}{20}\)
a 1/6+x=14/5
x=14/5-1/6
x= 79/30
b 8/5:x=11/6*7/4
8/5:x=77/24
x=77/24:8/5
x=385/192
c x:3/4=11/3-24/10
x:3/4=19/5
x=19/5*3/4
x=57/20
x+1/2 + x+1/3 + x+1/4= x+1/ 5 + x+1/6
x+1/99 + x+2/98 + x+3/97= x+10/90 + x+11/89 + x+12/98
câu 1
=> x+1/2+x+1/3+x+1/4-x-1/5-x-1/6=0
=> (x+x+x-x-x)+(1/2+1/3+1/4-1/5-1/6)=0
=> x+43/60=0
=> x = -43/60
câu dưới làm tương tự bạn nhé!
Bài 142: Tính bằng cách hợp lí
1) 112 x 5 x 2. 2)2 x 247 x5
3) 2 x 4 x 3 x 5. 4) 20 x 7 x 5 x 8
5) 25 x 35 x 4. 6) 47 x 7 + 47 x3
7)5 x 7 x 9 x 2. 8)125 x 9 x 7 x 8
9) 4 x 97 x 25. 10) 8 x 9 10
11) 240 x 24 + 240 x 24. 12) 27 x 2 + 27 x 3 + 27 x 5
13) 48 x 4 + 48 x 3 + 48 x 2 + 48. 14) 247 x 36 + 247 x 64
15)76 x6 + 76 x 4. 16)249 x 101 - 249Bài 142: Tính bằng cách hợp lí
1) 112 x 5 x 2. 2)2 x 247 x5
3) 2 x 4 x 3 x 5. 4) 20 x 7 x 5 x 8
5) 25 x 35 x 4. 6) 47 x 7 + 47 x3
7)5 x 7 x 9 x 2. 8)125 x 9 x 7 x 8
9) 4 x 97 x 25. 10) 8 x 9 10
11) 240 x 24 + 240 x 24. 12) 27 x 2 + 27 x 3 + 27 x 5
13) 48 x 4 + 48 x 3 + 48 x 2 + 48. 14) 247 x 36 + 247 x 64
15)76 x6 + 76 x 4. 16)249 x 101 - 249
Đáp án tui trả lời ở câu hỏi dưới
4^15 x 5^30
27^16 x 9^10
A=72^3 X 54^2 : 1084
B=3^10 x 11 + 3^10 x 5 : 39x 24
giúp em với
\(4^{15}.5^{30}=\left(2^2\right)^{15}.5^{30}=2^{30}.5^{30}=\left(2.5\right)^{30}=10^{30}\)
\(27^{16}.9^{10}=\left(3^3\right)^{16}.\left(3^2\right)^{10}=3^{48}.3^{20}=3^{68}\)
\(\frac{72^3.54^2}{1084}=\frac{\left(2^3.3^2\right)^3.\left(2.3\right)^2}{2^2.271}=\frac{2^2.2^9.3^6.3^2}{2^2.271}=\frac{2^9.3^8}{271}\)
\(\frac{3^{10}.11+3^{10}.5}{39.24}=\frac{3^{10}.16}{39.24}=\frac{3.3.3^8.2.8}{3.13.3.8}=\frac{3^8.2}{13}\)(Cái này đoán đề thoi, thật sự câu này viết đề chả hiểu gì)
tìm x
0,125+7/5.(x-1/8)
(23/5/24 - 22/2/15):(11/5/3 - 10/11/20)