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a)17.85-15.17-120
=17.(85-17)-120
=17.68-12
=1156-120
=1036
b)100:[30-(6-1)^ 2]
=100 :[30-5^ 2]
= 100:[30-25]
=100:5=20
c)/-10/+4+3.2^3+(-14)
=10+4+3.8 +(-14)
=14+24+(-14)
=[14 +(-14)]+24
=0+24=24
d)20-[30-(5-1)^ 2: 2]
=20-[30-4^2:2]
=20-[30-8]
=20-22=-2
e)80-(4.5^2-3.2^3)
= 80-(4.25-3.8)
=80-(4.25-3.2.4)
=80-4.(25-3.2)
= 80-4.19
= 80-76=4
g)35-{12-[-14+6-2)]}
=35 -{12-14-6+2}
=35-12+14+6-2
=23+14+6-2
=37+6-2
=43-2=41
a3.52-16:22 b 23.17-23.14 c15-141+59.15=sai đề e 10-[30-(5-1)2]=sai đề
=3.25-16:4 =23.(17-14) d 17.85+15.17-120
=75-4 =23.3 =17.(85+15)-120
=71 =8.3=24 =17.100-120
=1700-120=1580
a) 2436:x=12
x=2436:12
x=203
b) 6x-5=613
6x=613+5
6x=618
x=618:6
x=103
c) 12(x-1)=0
x-1=0:12
x-1=0
x=0+1
x=1
d) 0:x=0
=>x\(\in\)N*
tick đúng nha
a/ ta có : 5.(27-17)2 - 611 : 69 = 5.102 - 611 :69
= 5.100 - 611-9 = 500 - 36 = 464
b/ ta có : (-15)+(-17) = -15 - 17 = -32
c/ ta có : 21.42 + 21.59 +21.52 = 21.(42 +59 +52 )
= 21. (16 + 59 + 25) = 21.100=2100
d/ ta có : 75 - (3.52 - 4.23 ) +20150 = 75 - (3.25 - 4.8) +1
= 75 - 43 +1 = 33
1. a) 17.85 + 15.17 - 120
= 17.( 85 + 15) - 120
= 17. 100 -120
= 1700 - 120
= 1580
b) 20 - [ 30 - (5 - 1)2 ]
= 20 - [ 30 - 42 ]
= 20 - [ 30 - 16 ]
= 20 - 14
= 6
2. a) 70 - 5.(x - 3) = 45
5.(x - 3) = 70 - 45
5.(x -3) = 25
x - 3 = 25 : 5
x - 3 = 5
x = 5 + 3
x = 8
b) 10 + 2.x = 45 : 43
10 + 2.x = 42
10 + 2.x = 16
2.x = 16 - 10
2.x = 6
x = 6 : 2
x =3
1)a:17.85+15.17-120=17.(85+15)-120=17.100-120=1700-120=1580
b: 20-[30-(5-1)^2 = 20-[30-4^2]=20-(30-16)=20-15=5
2)
a: 70-5(x-3)=45
5(x-3) = 70-45=25
x-3 = 25:5=5
x= 5+3=8
b: 10+2x = 4^5:4^3
10+2x = 4^2
10+2x = 16
2x = 16-10=6
x = 6:2=3
\(5.2^2-18:3\)
\(=5.4-18:3\)
\(=20-6=14\)
\(2^3.17-2^3.14\)
\(=8.17-8.14\)
\(=8.\left(17-14\right)\)
\(=8.3\)
\(=24\)
\(75-\left(3.5^2-4.2^3\right)\)
\(=75-\left(3.25-4.8\right)\)
\(=75-\left(75-32\right)\)
\(=75-43\)
\(=32\)
\(150+50:5-2.3^2\)
\(=150+50:5-2.9\)
\(=150+10-18\)
\(=142\)
#Rảnh
A, (-25). 21. (-2)2. (-|-3|). (-1)2015
B, (-5)3. 67. (-|-2|). (-1)2014
C, 35.18 – 5.7.28 + 35. (-90)
D, 24. (16 – 5) – 16. (24 – 5)
E, - 79. (73 – 27) – 73. (-79 + 27)
G, 31. (-18) + 31. (-8)-31
M, -48 + 48. (-78) + 48. (-21)
N, -|-17| + 2. [ 24: (-8) + (-5)2]
I, -|-7|. [(-2)4 + (-36): (-32)] – (-5)3
a)3.52-16:22 b)23.17-23.14
=3.25-16: 4 =23.(17-14)
=75-4=71 =8.3=24
c)15.141+59.15 d)17.85+15.17-120
=15.(141+59) =17.(85+15)-120
=15.200=3000 =17.100-120
=1700-120=1580
e)20-[30-(5-1)2]
=20-[30-42]
=20-16=4
a)= \(2^3\left(17-14\right)\)
\(=8.3\)
\(=24\)
b)\(=17\left(85+15\right)-120\)
\(=17.100-120\)
\(=1700-120\)
\(=1580\)
c)\(=\left(25.4\right).\left(125.8\right).\left(2.5\right)\)
\(=100.1000.10\)
\(=1000000\)
d)\(=24.53+24.87-24.40\)
\(=24\left(53+87-40\right)\)
\(=24.100\)
\(=2400\)
e)\(=5.7.77-7.60-7.7.25-15.6.7\)
\(=7\left(5.77-60-7.25-15.6\right)\)
\(=7\left(385-60-175-90\right)\)
\(=7.60\)
\(=420\)