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a) 54 + x - 65 + 3 = 12
54 + x - 65 = 9
54 + x = 74
x = 74 - 54
x = 20
b) x - 45 + 65 = 59
x - 45 = -6
x = -6 + 45
x = 39
\(a,54+x-65+3=12\)
\(\Leftrightarrow54+x-\left(65-3\right)=12\)
\(\Leftrightarrow54+x-62=12\)
\(\Leftrightarrow54-x=12+62\)
\(\Leftrightarrow54-x=74\)
\(\Leftrightarrow x=54-74\)
\(\Leftrightarrow x=-20\)
\(b,x-45+65=59\)
\(\Leftrightarrow x-\left(45-65\right)=59\)
\(\Leftrightarrow x-\left(-20\right)\)
\(\Leftrightarrow x+20=59\)
\(\Leftrightarrow x=59-20\)
\(\Leftrightarrow x=39\)
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25 + 55 + x = 130
25 + x = 130 - 55
25 + x = 75
x = 75 - 25
x = 50
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A)x+12=12+6
x=18-12
x=6
b)x-21=33-21
x=12+21
x=33
c)14-x=14-2
x=16-14
x=2
d)x-48=65-28
x=37+48
x=85
e)65-x=48+17
x=65-65
x=0
a,x+12=12+6
x+12=18
x=18-12
x=6
b, x-21=33-21
x-21=12
x=12+21
x=33
c, 14-x=14-2
14-x=12
x=14-12
x=2
d,x-48=65-28
x-48=37
x=37+48
x=85
e,65-x=48+17
65-x =65
x=65-65
x=0
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57 + 36 = 93
x + 35 = 120
x = 120 - 35
x = 85
65 x (2 +1) = 65 x 3
= 195
90 : 3 < 80 :2
HT
57 + 36 = 93
x + 35 = 120
x= 120 - 35
x=85
65 x ( 2 + 1 )
65 x 2 + 1
65 x 1 + 2
65 + 2
67
90 : 3 < 80 : 2
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65 – x = 15 + 17
65 – x = 32
x = 65 – 32
x = 33
Đáp án cần chọn là A
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![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
x + 65 x 2 = 130
(=) x + 65 = 130 : 2
(=) x + 65 = 65
(=) x = 65 - 65
(=) x = 0
T ik nha bạn =)))
Chúc bạn học tốt nhé !!!
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