7) -4(x + 41) = 400 8) 2x – 49 = 5 . 32 |
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a: Ta có: \(71-\left(x+33\right)=26\)
\(\Leftrightarrow x+33=45\)
hay x=12
b: Ta có: \(\left(x+73\right)-26=76\)
\(\Leftrightarrow x+73=102\)
hay x=29
c: Ta có: \(45-\left(x+9\right)=6\)
\(\Leftrightarrow x+9=39\)
hay x=30
a) 71 - ( 33 + x ) = 26
(33 + x ) = 71 -26
33 + x = 45
x = 45 - 33 = 12
b) ( x + 73 ) - 26 = 76
( x + 73 ) = 102
x = 102 - 73 = 29
c) 45 - ( x + 9 ) = 6
( x + 9 ) = 45 - 6 = 39
x = 39 - 9 = 30
d) 89 - ( 73 - x ) = 20
73 - x = 89 - 20
73 - x = 69
x = 73 - 69 = 4
e) 4(x+41) = 400
x + 41 = 400 : 4 = 100
x = 100 - 41 = 59
f) 11(x-9 ) = 77
x - 9 = 77 : 11 = 7
x = 7 + 9 = 16
g) x + 7 = 25 + 13 = 38
x = 38 - 7 = 31
h) x + 4 = 198 - 120 = 78
x = 78 - 4 = 74
i) x - 9 = 350 : 5 = 70
x = 70 + 9 = 79
j) 2x - 49 = 5 . 9 = 45
2x = 45 + 49 = 94
x = 94 : 2 = 47
k) 25 + 3( x - 8 ) = 106
3(x-8 ) = 106 - 25 = 81
x - 8 = 81 : 3 = 27
x = 27 +8= 35
l) 9( x + 4 ) - 25 = 20
9( x + 4 ) = 20 + 25 = 45
x + 4 =45 : 9 = 5
x = 5 - 4 = 1
m) 200 - ( 2x + 6 ) = 64
2x + 6 = 200 - 64 = 136
2x = 136 - 6 = 130
x = 130 : 2 = 65
a) x = 2.
b) x = 7.
c) x= 12.
d) x= 45.
e) x = 18.
f) x = 10.
a, 2 3 x + 5 2 x = 2 5 2 + 2 3 - 33
8x+25x = 33
33x = 33
x = 1
b, 260 : x + 4 = 5 2 3 + 5 - 3 3 2 + 2 2
260:(x+4) = 5.13–3.13
x+4 = 260:26
x+4 = 10
x = 6
c, 720 : [ 41 - 2 x - 5 ] = 2 3 . 5
41–(2x–5) = 720:40
2x–5 = 41–18
2x = 28
x = 14
d, 3 2 - 2 x - 12 + 35 = 5 2 + 279 : 3 2
7(x–12)+35 = 56
7(x–12) = 21
x–12 = 3
x = 15
140: ( x-8)=7
(x-8)=140:7
x-8=20
x =20+8
x=28
4(x+41)=400
(x+41)=400:4
(x+41)=100
x =100-41
x =59
11(x-9)=77
x-9=77:11
x-9=7
x =7+9
x =16
5(x-9)= 350
x-9=350:5
x-9 =70
x =70+9
x=79
2x - 49= 5.3 mũ 2
2x - 49=5.9
2x - 49=45
2x =45+49
2x =94
x =94:2
x =47
200 - ( 2x + 6)= 4 mũ 3
200 - ( 2x + 6)=64
2x + 6=200 - 64
2x + 6 =136
2x = 136-6
2x =130
x =65
học tốt
7) -4(x +41) = 400
x + 41 = 400 : -4 = -100
x = -100 - 41 = 141
8) 2x - 49 = 5 . 32 = 5 . 9
2x = 9 + 49 = 58
x = 58 : 2 = 29
7) \(-4x-246=400\Leftrightarrow-4x=646\Leftrightarrow x=-161,5\)
8) \(2x-49=45\Leftrightarrow2x=94\Leftrightarrow x=47\)