[(5^2+55)-30].2+120
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Mở máy. Bấm tổ hợp phím:
a) 2 ( 3 x 5 \(x^2\) - 2 ( 5 + 7 ) ) +3 \(x^{[]}\) 3 =
Kết quả:129
b) 3 ( 120 + ( 55 - ( 11 - 3 x 2 ) \(x^2\) ) ) +2 \(x^{[]}\) 3 =
Kết quả: 458
45- { [(120-60):15+5]:3} + (-55)
= 45 - { [60:15+5]:3} + (-55)
= 45 - {9:3} +(-55)
= 45 - 3 + (-55) = -13
b) \(6^2-2^3.5^0.6=36-8.1.6\)
\(36-48=-12\)
TICK MIK NHA
b1: (47-x) .15+25=55
(47-x) .15=55-25
(47-x)x15=30
47-x=30:15
47-x=2
x=47-2
x=45
vậy x=45
b2: 120-2(x+5)=100
2(x+5)=120-100
2(x+5)=20
x+5=20:2
x+5=10
x=5
vậy x=5
chúc bn học tốt
(47-x).15=55-25
(47-x).15=30
(47-x)=30:15
(47-x)=2
x=47-2
x=45
vậy x=45
2(x+5)=120-100
2(x+5)=12
(x+5)=12:2
(x+5)=6
x=6-5
x=1
vậy x=1
5x ( x - 2 ) = 120 - 55
5x ( x - 2 ) = 65
x - 2 = 65 : 5
x - 2 = 13
x = 13 + 2
x = 15
nhớ ủng hộ cho mik
A = \(\dfrac{1}{2}\) + \(\dfrac{5}{6}\) + \(\dfrac{11}{12}\) + \(\dfrac{19}{20}\) + \(\dfrac{29}{30}\) + \(\dfrac{41}{42}\) + \(\dfrac{55}{56}\)
A = (1 - \(\dfrac{1}{2}\)) + ( 1 - \(\dfrac{1}{6}\)) + (1 - \(\dfrac{1}{12}\)) + (1 - \(\dfrac{1}{20}\)) +(1-\(\dfrac{1}{30}\))+(1-\(\dfrac{1}{42}\))+(1-\(\dfrac{1}{56}\))
A = (1 + 1+1 + 1 + 1+1+1)- (\(\dfrac{1}{2}\)+\(\dfrac{1}{6}\)+\(\dfrac{1}{12}\)+\(\dfrac{1}{20}\)+\(\dfrac{1}{30}\)+\(\dfrac{1}{42}\)+\(\dfrac{1}{56}\))
A = 7 - (\(\dfrac{1}{1\times2}\)+\(\dfrac{1}{2\times3}\)+\(\dfrac{1}{3\times4}\)+\(\dfrac{1}{4\times5}\)+\(\dfrac{1}{5\times6}\)+\(\dfrac{1}{6\times7}\)+\(\dfrac{1}{7\times8}\))
A = 7 - (\(\dfrac{1}{1}\) - \(\dfrac{1}{2}\)+ \(\dfrac{1}{2}\) - \(\dfrac{1}{3}\) + \(\dfrac{1}{3}\) - \(\dfrac{1}{4}\) + \(\dfrac{1}{4}\) - \(\dfrac{1}{5}\) + \(\dfrac{1}{5}\) - \(\dfrac{1}{6}\)+\(\dfrac{1}{6}\)-\(\dfrac{1}{7}\)+\(\dfrac{1}{7}\)-\(\dfrac{1}{8}\))
A = 7 - (\(\dfrac{1}{1}\) - \(\dfrac{1}{8}\))
A = 7 - \(\dfrac{7}{8}\)
A = \(\dfrac{49}{8}\)
[(52+55)-20].2+120=[(25+55)-20].2+120
=[80-20].2+120
=100.2+120
=200+120
=320
[(52+55)-20].2+120
= [80-20].2+120
=60.2+120
=120+120
=240
k cho mình nha (^_^) !!!