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Sửa đề: {[(52 x 23) - 72 x 2 ] : 2 } x 6 - 7 x 25
={[(25 x 8) - 49 x 2] : 2} x 6 - 7 x 32
=[(200 - 98) : 2] x 6 - 224
=(102 : 2) x 6 - 224
= 51 x 6 - 224
= 306 - 224
= 82
1. a) 17.85 + 15.17 - 120
= 17.( 85 + 15) - 120
= 17. 100 -120
= 1700 - 120
= 1580
b) 20 - [ 30 - (5 - 1)2 ]
= 20 - [ 30 - 42 ]
= 20 - [ 30 - 16 ]
= 20 - 14
= 6
2. a) 70 - 5.(x - 3) = 45
5.(x - 3) = 70 - 45
5.(x -3) = 25
x - 3 = 25 : 5
x - 3 = 5
x = 5 + 3
x = 8
b) 10 + 2.x = 45 : 43
10 + 2.x = 42
10 + 2.x = 16
2.x = 16 - 10
2.x = 6
x = 6 : 2
x =3
1)a:17.85+15.17-120=17.(85+15)-120=17.100-120=1700-120=1580
b: 20-[30-(5-1)^2 = 20-[30-4^2]=20-(30-16)=20-15=5
2)
a: 70-5(x-3)=45
5(x-3) = 70-45=25
x-3 = 25:5=5
x= 5+3=8
b: 10+2x = 4^5:4^3
10+2x = 4^2
10+2x = 16
2x = 16-10=6
x = 6:2=3
(52010 - 52008) : 52008 = 52010 : 52008 - 52008 : 52008 = 52 - 1 = 25 - 1 = 24
(72005 + 72004) : 72004 = 72005 : 72004 + 72004 : 72004 = 7 + 1 = 8
[(52 .23 - 72.2) : 2].6 - 7.25 = (52. 23 : 2 - 72.2:2).6 - 7.25 = (52. 22 - 72).6 - 7.25 = (25.4 - 49).6 - 7. 32 = (100 - 49).6 - 224 = 51.6 - 224 = 306 - 224 = 82
a, 32 x 35 + 32 x 65 b, 150 : [ 25 x ( 18- 42)]
= 32 x ( 35 +65) = 150 : [ 25 x ( 18-16)]
= 9 x 100 = 150 : ( 25 x 2)
= 900 = 150 : 50 = 3
c, 57 : 54 - 21 x 22
= 53- 2 x 4
= 125-8
=117
a) 3 ^ 2 x 35 + 3 ^ 2 x 65 = 9 x 35 + 9 x 65 = 9 x ( 65 + 35 ) = 9 x 100 = 900
\(3.2^3+5^2.7-125=3.8+25.7-125\)
\(=24+175-125\)
\(=74\)
A) Ta có: 28 x ( 231 + 69) + 72 x ( 231 + 69)
= ( 28 + 72 ) x ( 231 + 69)
= 100 x 300
= 30 000
b) 2017 - { 52 x 22 - 11 [ 72 - 5 x 23 + 8 x (112 - 121) ] }
= 2017 - { 100 - 11 [ 49 - 40 + 8 x 0 ] }
= 2017 - { 100 - 1 [ 9 + 0 ]
= 2017 - { 100 - 1 x 9 }
= 2017 - { 99 x 9 }
= 2017 - 891
= 1126
c) 10 - { [ ( x : 3 + 17) : 10 + 2 x 24 ] : 10 } = 5
=> { [( x : 3 + 17 ) : 10 + 2 x 16 ] : 10 } = 10 - 5 = 5
=> [ ( x : 3 + 17) : 19 + 32 ] = 5 x 10 = 50
=> ( x : 3 + 17 ) : 19 = 50 - 32 = 18
=> x : 3 + 17 = 18 x 19 = 342
=> x : 3 = 342 - 17 = 325
=> x = 325 x 3
=> x = 975
Vậy x = 975
a, (-15)+(32.5+80):52
(-15)+(9.5+80):25 = (-15)+(45+80):25 = (-15)+125:25=(-15)+5= -10
b,5.(12-3x)-20=10
5.(12-3x)=10+20 5.(12-3x)=30 12-3x=30:5 12-3x=6 3x=12-6 3x=6 x=6-3 x=3 Vậy x=3
\(\left(-150+3^2\cdot5+80\right):5^2\)
\(=\left(-70+45\right):25\)
\(-25:25\)
\(=-1\)
=45:(390:(5*100-(125+49*5)
=45:(390:(500-(125+245)
=45:(390:(500-370)
=45:(390:130)
=45:3
=15
tick nhé
45 : ( 390 : ( 5 x 102 - ( 53 + 72 x 5 )))
=45 : ( 390 : ( 5 x 100 - ( 125+ 49 x 5 )))
=45 : ( 390 : ( 5 x 100 - (125+245)))
=45 : ( 390 : ( 5 x 100 - 370))
=45 : ( 390 : (500-370))
=45:(390:130)
=45:3
=15