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150 - [ 120 - ( 7 - 22 ) ] =
= 150 - [ 120 - ( 7 - 4 ) ]
= 150 - [ 120 - 3 ]
= 150 - 117
= 33
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Bài 2:
a: 4x+320=480
=>4x=160
hay x=40
b: 150-x:7=120
=>x:7=30
hay x=210
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\(A=2+2^2+2^3+...+2^{199}+2^{200}\)
\(A=\left(2+2^2+2^3\right)+...+\left(2^{198}+2^{199}+2^{200}\right)\)
\(A=2\left(1+2+2^2\right)+...+2^{198}\left(1+2+2^2\right)\)
\(A=2.7+...+2^{198}.7\)
\(A=7\left(2+...+2^{198}\right)\)chia hết cho 7
\(\Rightarrow A\)chia hết cho 7
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A=134-{150:50-[120:4+25-(11,3+18,7)]}
=134-{150:50-[120:4+25-30]}
=134-{150:50-[30+25-30]}
=134-{150:50-[30-30+25]}
=134-{150:50-[0+25]}
=134-{150:50-25}
=134-{30-25}
=134-5
=129
B=(102+112+122):(132+142)
= [ \((10+11+12)^2\) ]: \([(13+14)^2]\)
= \(33^2\): \(27^2\)
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a) Ta có : 2x = 52 + 20170 . 7
2x = 25 + 1 . 7
2x = 25 + 7 = 32
2x = 25
x = 5
b) 75 - [ 100 - ( 7 - 2 )2 ]
= 75 - ( 100 - 52 )
= 75 - ( 100 - 25 )
= 75 - 75
= 0
c) Ta có : 120 = 23 . 3 . 5
144 = 24 . 32
BCNN ( 120 , 144 ) = 24 . 32 . 5 = 720
a) 2x=52+20170.7
2x=52+1.7
2x=25+7
2x=32
2x=25
vậy x=5
b) 75-[ 100-(7-2)2 ]
75-[ 100-52]
75-[ 100-25]
75-75
0
c) cái này dễ bn tự tìm
150 - [ 120 - ( 7 - 22 )]
= 150 - [ 120 - ( 7 - 4 )]
= 150 - ( 120 - 3 )
= 150 - 117
= 33
150-[120-(7-\(2^2\))]
=150-[120-(7-4)]
=150-(120-3)
=150-117
=33
nha