472/24=???????????????????????????
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a. 2x - 3 = 125 : 25
2x - 3 = 5
2x = 5 + 3
2x = 8
x = 8 : 2 = 4
b. 472 : ( 24 + 5x ) + 8 = 16
( 24 + 5x ) + 8 = 472 : 16
( 24 + 5x ) + 8 = 29,5
24 + 5x = 29,5 - 8
24 + 5x = 21,5
5x = 21,5 - 24
5x = -2,5
x = -2,5 : 5 = -0,5
a.
(2x - 3).25 =125
2x - 3 =125 : 25
2x - 3 = 5
2x =5 + 3
2x = 8
x = 8 :2
x =4
b.
472 : (24 +5x) + 2 mủ 3 =16
472 :(24 + 5x) + 8 = 16
472 :(24 + 5x) = 16 - 8
472 :(24 + 5x) = 8
24 + 5x = 472 : 8
24 + 5x =59
5x = 59 - 24
5x = 35
x =35:5
x = 7
5x =
1.
$=153^2+2.47.153+47^2=(153+47)^2=200^2=40000$
2.
$=1,24^2-2.1,24.0,24+0,24^2=(1,24-0,24)^2=1^2=1$
3. Không phù hợp để tính nhanh
4.
$=15^8-(15^8-1)=1$
5.
$=(1^2-2^2)+(3^2-4^2)+(5^2-6^2)+...+(2019^2-2020^2)$
$=(1-2)(1+2)+(3-4)(3+4)+(5-6)(5+6)+...+(2019-2020)(2019+2020)$
$=(-1)(1+2)+(-1)(3+4)+(-1)(5+6)+....+(-1)(2019+2020)$
$=(-1)(1+2+3+4+....+2019+2020)=(-1).2020(2020+1):2=-2041210$
6:
\(\left(2+1\right)\left(2^2+1\right)\left(2^4+1\right)....\left(2^{2020}+1\right)+1\\ =1.\left(2+1\right)\left(2^2+1\right)\left(2^4+1\right)....\left(2^{2020}+1\right)+1\\ =\left(2-1\right)\left(2+1\right)\left(2^2+1\right)\left(2^4+1\right)....\left(2^{2020}+1\right)+1\\ =\left(2^2-1\right)\left(2^2+1\right)\left(2^4+1\right)....\left(2^{2020}+1\right)+1\\ =\left(2^4-1\right)\left(2^4+1\right)....\left(2^{2020}+1\right)+1\\ =\left(2^8-1\right)....\left(2^{2020}+1\right)+1\\ =\left(2^{2020}-1\right)\left(2^{2020}+1\right)+1\\ =2^{4040}-1+1=2^{4040}\)
a. 472:(24+7.x)+23=26
472:(24+7.x)+8=26
472:(24+7.x)=26-8
472:(24+7.x)=18
24+7.x=472:18
24+7.x=27
7.x=27-24
7.x=3
x=3:7
x=\(\frac{3}{7}\)
b. 18-|x-1|=2
|x-1|=18-2
|x-1|=16
TH1: x-1=16
x=16+1
x=17
TH2: x-1=-16
x=-16+1
x=-15
Vậy x=17 hoặc x=-15
a) \(472:\left(24+7.x\right)+2^3=26\)
\(472:\left(24+7.x\right)=26-8\)
\(472:\left(24+7.x\right)=18\)
\(24+7.x=472.18\)
\(24+7.x=8496\)
\(7.x=24+8496\)
\(7.x=8520\)
\(x=7.8520\)
\(x=59640\)
b)\(18-|x-1|=2\)
\(x-1=18-2\)
\(x-1=16\)
\(x=16-1\)
\(x=15\)
Hk tốt,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
k nhé
\(a,25\times47\times4\times2=\left(25\times4\right)\times\left(47\times2\right)=100\times94=9400\\ b,865\times99+865=865\times\left(99+1\right)=865\times100=86500\\ c,472\times1002-472-472=472\times\left(1002-1-1\right)=472\times1000=472000\\ d,2478+10275+7522-275=\left(2478+7522\right)+\left(10275-275\right)=10000+10000=20000\)
472 + 34 - ( 472 - 16 )
= 472 + 34 - 472 + 16
= ( 472 - 472 ) + ( 34 + 16 )
= 0 + 50
= 50
Học tốt nhé bạn !
472 +34 - ( 472 - 16 )
= (34 + 16 ) -( 472 - 472 )
= 50 - 0
= 50