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a) 23.15 - [115 - (12-5)2]
= 8.15 - [115 - 72]
= 120 - [115 - 49]
= 120 - 66
= 54
b) 30 : {175 : [355 - (135+37.5)]}
= 30 : {175 : [355 - (135 + 185)]}
= 30 : {175 : [355 - 320]}
= 30 : {175 : 35}
= 30 : 5
= 6
c) 12 : {390 : [500 - (125+35.7)]}
= 12 : {390 : [500 - (125+245)]}
= 12 : {390 : [500 - 370]}
= 12 : {390 : 130}
= 12 : 3
= 4
a, 32 . 5 - 2x . 6 + 183
= 9 . 5 - 2x . 6 + 1
= 45 - 2x . 6 + 1
= 45 - 2x + 1 . 3 + 1
= 3( 15 - 2x + 1) + 1
b, 100 : { 280 : [ 450 - ( 480 - 4 . 52 ) ] }
= 100 : { 280 : [ 450 - 380 ] }
= 100 : { 280 : 70 }
= 100 : 4 = 25
c, 8 . { 24 - [ 3 . ( 5 + 25 ) + 15 ] : 15 }
= 8 . { 24 - [ 3 . 30 + 15 ] : 15 }
= 8 . { 24 - 105 : 15 }
= 8 . { 24 - 7 }
= 8 . 17 = 136
100:{250:[450-(4.53-22.25)}]
=100:{250:[450-(500-100)]}
=100:{250:[450-400]}
=100:{250:50}
=100:5
=20
100:{250:[450-(4.5^3-2^2.25)]}
=100:{250:[450-(4.125-4.25)]}
=100:{250:[450-(500-100)]}
=100:{250:[450-400]}
=100:{250:50}
=100:5
=20
~Chúc học tốt!~
\(100:\left\{250:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}\)
= \(100:\left\{250:\left[450-\left(2^2.5^3-2^2.5^2\right)\right]\right\}\)
= \(100:\left\{250:\left[450-2^2.5^2\left(5-1\right)\right]\right\}\)
= \(100:\left[250:\left(450-100.4\right)\right]\)
=\(100:\left(250:50\right)\)
= \(100:5\)
= \(20\)
tìm x
a) 7(x-4)3+30=219
7(x-4)3=219-30
7(x-4)3=189
(x-4)3=189:7
(x-4)3=27
(x-4)3=33
x-4=3
x=3+4
x=7
b,720:[41(2.x-5)]=40
41(2.x-5)=720:40
41(2.x-5)=18
2.x-5=18:41
2.x-5=\(\frac{18}{41}\)
2.x=\(\frac{18}{41}\)+5
2.x=\(\frac{223}{41}\)
x=\(\frac{223}{41}\):2
x=\(\frac{223}{82}\)
Tính
c)100:{250:[450-(4.53-22.25]}
=100:{250:[450-(4.125-4.25]}
=100:{250:[450-[500-100]}
=100:{250:[450-400]}
=100:{250:50}]
=100:50
=2
(li-ke cho mình nha)
1) 100 : { 250 : [ 450 - ( 4 x 53 - 22 x 25 ) ] }
= 100 : { 250 : [ 450 - ( 4 x 125 - 4 x 25 ) ] }
= 100 : { 250 : [ 450 - ( 500 - 100 ) ] }
= 100 : [ 250 : ( 450 - 400 ) ]
= 100 : ( 250 : 50 )
= 100 : 5
= 20
2) 30 : { 175 : [ 355 - ( 135 + 37 x 5 ) ] }
= 30 : { 175 : [ 355 - ( 135 + 185 ) ] }
= 30 : [ 175 : ( 355 - 320 ) ]
= 30 : ( 175 : 35 )
= 30 : 5
= 6
chúc bạn học giỏi
1) 100 : { 250 : [ 450 - ( 4 x 53 - 22 x 25 ) ] }
= 100 : { 250 : [ 450 - ( 4 x 125 - 4 x 25 ) ] }
= 100 : { 250 : [ 450 - ( 500 - 100 ) ] }
= 100 : [ 250 : ( 450 - 400 ) ]
= 100 : ( 250 : 50 )
= 100 : 5
= 20
2) 30 : { 175 : [ 355 - ( 135 + 37 x 5 ) ] }
= 30 : { 175 : [ 355 - ( 135 + 185 ) ] }
= 30 : [ 175 : ( 355 - 320 ) ]
= 30 : ( 175 : 35 )
= 30 : 5
= 6