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24 : {300 : [375 - (150 + 15 x 5)
= 24 : {300 : [375 - (150 + 75)
= 24 : [300 : (375 - 225)]
= 24 : (300 : 150)
= 24 : 2
= 12
1449-[216-184:8).9]
=1449-[216-23).9]
=1449-(193.9)
=1449-1737
=-288
24 : { 300 : [ 375 ( 150 + 15 . 5 ) ] }
24 : { 300 : [ 375 ( 150 + 75 ) ] }
24 : [ 300 : ( 375 . 225 ) ]
24 : ( 300 : 84375 )
24 : 4/1125
= 6750
a) 50+3x(25-16)2+150
=50+3x92+1
=50+3x81+1
=50+243+1
=294
b)22x52-35/32
=(2x5)2-35-2
=102-33
=100-27
=73
c)80-[130-(12-4)2 ]
=80-[130-82 ]
=80-[130-64]
=80-66
=14
d)100:[2x(52-35-8)]
=100:[2x9]
=100:18
=100/18
e)24:{300:[375-(150+15x5)]}
=24:{300:[375-(150+75)]}
=24:{300:[375-225]}
=24:{300:50}
=24:6
=4
Ta có ; A = \(\frac{1}{3}+\frac{1}{3^2}+\frac{1}{3^3}+.......+\frac{1}{3^{300}}\)
\(\Rightarrow3A=1+\frac{1}{3}+\frac{1}{3^2}+......+\frac{1}{3^{199}}\)
\(\Rightarrow3A-A=1-\frac{1}{3^{300}}\)
\(\Rightarrow2A=1-\frac{1}{3^{300}}\)
\(\Rightarrow A=\frac{1-\frac{1}{3^{100}}}{2}\)
a) 125 + 70 + 375 + 230 = (125 + 375) + (70 + 230) = 500 + 300 = 800
b) 62 : 4 . 3 + 2 . 52 = 62 : 22 . 3 + 2 . 25 = 32 . 3 + 50 = 33 + 50 = 27 + 50 = 77
c) 150 : [25 . (18 - 42)] = 150 : (25 . 2) = 150 : 50 = 3
áp dụng quy tắc đổi dấu
b) 35-19+2019-35-2019=-19+[(35-35)-(2019-2019)]
=-19+0+=-19
a) \(124+\left(-56\right).124+\left(-124\right)\left(-47\right)=124.1-56.124+124.47\)
\(=124.\left(1-56+47\right)=124.\left(-8\right)=-992\)
b) \(35-19+2019-35+\left(-2019\right)=35-19+2019-35-2019\)
\(=\left(35-35\right)+\left(2019-2019\right)-19=0+0-19=0-19=-19\)
c) \(345-150\div\left[\left(3^3-24\right)^2-\left(-21\right)\right]+2020^0\)
\(=345-150\div\left[\left(27-24\right)^2+21\right]+1=345-150\div\left(3^2+21\right)+1\)
\(=345-150\div24+1=345-6,25+1=339,75\)
A, 48.31+51.31+31+119
=31.(48+51+1)+119
=31.100+119
=3100+119
3219
B,4.9-56:8-1
=36-7-1
=28
a,48.31+51.31+150
=31.(48+51)+150
=31.99+150
=3069+150
=3219
b,4.3^2-56:2^3-1^100
=4.9-56:8-1
=36-7-1
=26
24:{300:[375-(150+3.5^2)]}
=24:{300:[375-(150+3.25)]}
=24:{300:[375-(150+75)]}
=24:{300:[375-225]}
=24:{300:150}
=24:2
=12