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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
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=\left\{145-\left[130-10\right]:2\right\}\cdot5\)
\(=\left\{145-60\right\}\cdot5=85\cdot5=425\)
b: \(=100:\left\{250:\left[450-4\cdot125+4\cdot25\right]\right\}\)
\(=\dfrac{100}{250:\left[450-500+100\right]}=\dfrac{100}{250:50}=\dfrac{100}{5}=20\)
c: \(=355-5\cdot\left[64-\left(27-25\right)\right]=355-5\cdot\left[64-2\right]\)
\(=355-310=45\)
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a) 24.5 - [ 131. ( 13 - 4 )2 ]
=120 - [ 131 . 92 ]
=120 - [ 131 . 81 ]
=120 - 10611
= - 10491
b) 100 : {230:[450−(4−53−52.25)]}
= 100 : \(\left\{230:\left[450-\left(4-125-25.25\right)\right]\right\}\)
= \(100:\left\{230:\left[450-\left(4-125-625\right)\right]\right\}\)
= \(100:\left\{230:\left[450-\left(-746\right)\right]\right\}\)
=\(100:\left\{230:1196\right\}\)
= 100 : \(\dfrac{5}{26}\)= 520
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a) = [ 499+ (-499) ] + [ (-287)+285 ]
= 0 + -2 =-2
b) có 4 cặp số
mà mỗi cặp = -2
-2 . 4 = -8
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b: Ta có: \(1992+\left(-53\right)+158+\left(-247\right)+\left(-1592\right)\)
\(=\left(1992-1592\right)+\left(-53-247\right)+158\)
\(=400-300+158=258\)
355-(-345+499)+450
=355+345-499+450
=(355+345)+(450-499)
=700+1=701
355-(-345+499)+450
=355+345-499+450
=(355+345)-(499-450)
=700-49=651