272 x 253 x 25
6 x 154 x 18
154 + 984 - 720 = ?
213 - 25 - 12 + 547 - 87 = ?
25 x 18 x 36 = ?
154+984-720=418
213-25-12+547-87=636
25x18x36=16200
154 +984 -720 = 418
213 - 25 - 12 + 547 - 87 = 636
24 x 18 x 36 = 16200
Viết các biểu thức sau dưới dạng một lũy thừa:
1,125 x 27
2, 12^3 x 64
3, 25^6 x 8^3
4, 25^6 x 125^3
5, 625^5 : 25^7
`a, = 5^3 xx 3^3 = 15^3`
`b, = 12^3 xx 4^3 = 48^3`
`c, = 625^3 xx 8^3 = 5000^3`
`d, = 625 ^3 xx 125^3 = 78125^3`
`e, = 5^20 : 5^14 = 5^6`
1,\(125\cdot27=5^3\cdot3^3=\left(5\cdot3\right)^3=15^3\)
2, \(12^3\cdot64=12^3\cdot4^3=\left(12\cdot4\right)^3=48^3\)
3, \(25^6\cdot8^3=\left(5^2\right)^6\cdot\left(2^3\right)^3=5^8\cdot2^9\)
4, \(25^6\cdot125^3=\left(5^2\right)^3\cdot\left(5^3\right)^3=5^6\cdot5^9=5^{15}\)
5,\(625^5:25^7=\left(5^4\right)^5:\left(5^2\right)^7=5^{20}:5^{14}=5^6\)
1: Tính nhanh :
a) 437 + 541 + 463 - 341
b) 562 + 389 - 462 + 611
c) ( 417 + 536 ) + ( 583 - 436 )
d) 325 x 6 + 6 x 560 + 115 x 6
e)133 : 7 + 154 : 7 + 413 : 7
f) 2 x 13 x 5 x 4 x 17 x 25
g) 125 x 36 x 8
h) 28 x 14 x 25
i) 125 x 31 x 72
k) 417 x 28 - 28 x 317 + 5200
l) 3 x 78 x 8 + 6 x 22 x 4 - 24 x 10
m) 3 x 128 x 12 - 4 x 28 x 9 + 18 x 100 x 2
n) 50 x 76 + 25 x 18 - 14 x 125
a)437+541+463-341
=(437+463)+(541-341)
=900+200
=1100
Tinh nhanh
253 x 75 - 161 x 37 + 253 x 25 - 63 / 100 x 47 -12 x 3,5 - 5,8 : 0,1
Tính nhanh :
253 x 75 - 161 x 37 + 253 x 25 - 161 x 63
100 x 47 - 12 x 3,5 - 5.8 : 0,1
253 x 75 - 161 x 37 + 253 x 25 - 161 x 63
= 253 x (75 + 25) - 161 x (37 + 63)
=253 x 100 - 161 x 100
=23500 - 16100
=37400
100 x 47 - 12 x 3,5 - 5,8 : 0,1
=4700 - 42 - 58
=4700 - (42 + 58)
=4700 - 100
=4600
Bµi 1 1 37064 – 64 x 82 42966 217 2 320 – 120.5 95,25 5,25 874 12 x 12,53 132 x 9 132 4 48 x 17 48 x 3 5 56 x 27 56 x 35 62 6 45 x 48 – 90 x 24 145 7 754 x 75 – 2262 x 25 4568 8 1050 15 – 350 5 1769 4320 9 – 8640 18 750 10 316 192 384 321 108 11 24 25 26 ….. 124 125 126 12 154 – 153 152 – 151 150 – 149 ….. 4 – 3 2 – 113 37 x 38 – 19 x 74 1000 14 0.48 x 500 – 2.4 x 40 x 2
bài 6:Tìm x, biết:A,1/4x-1/3=-5/9;B,3,5-Ix-1/2I=0,75;C,x-1/x-5=6/7;D,(x-4)mũ 2=25;E,2 mũ x+2 mũ x-4=272;F,(x+1/2)(2/3-2x)=0
tìm x \(\varepsilonℤ\)
a) 159 - ( 25 - x ) = 43
b) ( 79 - x ) - 43 = - ( 17 - 25 )
c) - ( - x + 13 - 142 ) + 18 = 55
d) ( 102 - 15 ) - ( 15 - x ) = 6
e) \(|x+3|\)= 10
f) - 154 + ( x - 9 - 8 ) = 40
AI GIÚP MK VỚI , NHANH , ĐÚNG TICK NHA
\(a,159-\left(25-x\right)=43\)
\(\Leftrightarrow25-x=195-43\)
\(\Leftrightarrow25-x=152\)
\(\Leftrightarrow x=25-152\)
\(\Leftrightarrow x=-127\)
\(b,\left(79-x\right)-43=-\left(17-25\right)\)
\(\Leftrightarrow\left(79-x\right)-43=8\)
\(\Leftrightarrow79-x=8+43\)
\(\Leftrightarrow79-x=51\)
\(\Leftrightarrow x=79-51\Rightarrow x=28\)
\(-\left(-x+13-142\right)+18=55\)
\(\Leftrightarrow-\left(-x+13-142\right)=55-18\)
\(\Leftrightarrow-\left(-x+13-142\right)=37\)
\(\Leftrightarrow x+13-142=37\)
\(\Leftrightarrow x=37+142-13\)
\(\Leftrightarrow x=166\)
\(d,\left(102-15\right)-\left(15-x\right)=6\)
\(\Leftrightarrow87-\left(15-x\right)=6\)
\(\Leftrightarrow15-x=87-6\)
\(\Leftrightarrow15-x=81\Rightarrow x=15-81\)
\(\Leftrightarrow x=-66\)
\(e,/x+3/=10\)
\(TH1:x+3=10\) \(TH2:x+3=-10\)
\(x=7\) \(x=-13\)
Vậy x = 7 hoặc -13
272+ ( 146 + x ) = 118
272 - ( 4.x + 15 ) = 45
x - 36 : 18 = 16
#Rin
\(272+\left(146+x\right)=118\)
\(272+146+x=118\)
\(418+x=118\)
\(x=118-418\)
\(x=-300\)
Bài làm
a) 272+ ( 146 + x ) = 118
146 + x = 272 - 118
146 + x = 154
x = 154 - 146
x = 8
Vậy x = 8
b) 272 - ( 4.x + 15 ) = 45
4x + 15 = 272 - 45
4x + 15 = 227
4x = 227 - 15
4x = 112
x = 112 : 4
x = 28
Vậy x = 28
c) x - 36 : 18 = 16
x - 2 = 16
x = 18
Vậy x = 18
# Học tốt #
1>=> 146+x=-154
=>x=-300
2> => 4x+15=227
=>4x=212
=>x=53
37>=> x- 2=16
==>x=18