1.15X-133=17
2.14X+54=82
3.17X-20=14
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A, 7[x + 5] - 20 = 190
7x + 35 - 20 = 190
7x + 15 = 190
7x = 175
x = 25
B, 155 - 10[x + 1] = 55
155 - 10x - 10 = 55
-10x + 90 = 55
-10x = -35
x = 3.5
C, 6[x + 2^3] + 40 = 100
6[x + 8] + 40 = 100
6x + 48 + 40 = 100
6x + 88 = 100
6x = 1
2 x = 2
D, 15x - 133 = 17
15x = 150
x = 10
E, 90[x + 2] = 45
90x + 180 = 45
90x = -135
x = -1.5
F, 4x + 54 = 82
4x = 28
x = 7
G, 17x - 20 = 14
17x = 34
x = 2
#\(N\)
`a, -677*54+54.(-125)+2.54`
`=54.(-677+-125+2)`
`=54.(-800)`
`=-43200`
`b, -(324-267+252)+(133-76)`
`=-324+267-252+133-76`
`= (-324+-76)+(133+267)-252`
`=-400+400-252`
`=-252`
a: =54(-677-125+2)
=54*(-800)
=-43200
b: =-324+267-252+133-76
=-400+400-252
=-252
54 x 133 x 45 x 133 + 133
= ( 54 + 45 + 1 ) x 133
= 100 x 133
= 13300
54 x 133 + 45 x 133 + 133
= 133 x ( 45 + 54 + 1 )
= 133 x 100
= 13300
\(\frac{54\times107-53}{53\times107+54}=\frac{53\times107+107-53}{53\times107+54}=\frac{53\times107+54}{53\times107+54}=1\)
\(\frac{135\times269-134}{134\times269+135}=\frac{134\times269+269-134}{134\times269+135}=\frac{134\times269+135}{134\times269+135}=1\)
THAM KHẢO :
A = 53.107 + 54 53 + 1 .107 − 53
= 53.107 + 54 53.107 + 107 − 53
= 53.107 + 54 53.107 + 54 = 1.
B = 134.269 + 135 134 + 1 .269 − 133
= 134.269 + 135 134.269 + 269 − 133
= 134.269 + 135 134.269 + 136 > 1
⇒A < B
1.
15X-133=17
15X=17+133
15X=150
X=150:15
X=10
2.
14X+54=82
14X=82+54
14X=28
X=28:14
X=2
3.
17X-20=14
17X=14+20
17X=34
X=34:17
X=2
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