Toán Lớp 6: Câu 2: Tìm x biết:
a) 12 + (5 + x) = 20
b) 175 + (30 – x) = 200
c) 10 + 2x = 45 : 43
d) 10x + 22.5 = 102
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Toán Lớp 6: Câu 2: Tìm x biết:
a) 12 + (5 + x) = 20
b) 175 + (30 – x) = 200
c) 10 + 2x = 45 : 43
d) 10x + 22.5 = 102
Comments ( 2 )
Câu 2: Tìm x biết:
a) 12 + (5 + x) = 20
5 + x = 20 – 12
5 + x = 8
x = 8 – 5 = 3
b) 175 + (30 – x) = 200
30 – x = 200 – 175
30 – x = 25
x = 30 – 25 = 5
c) 10 + 2x = 4^5 : 4³
x = 11
d) 10x + 2².5 = 102
x = 61
a)
12 + ( 5 + x ) = 20
=> 12 + 5 + x = 20
=> 17 + x = 20
=> x = 20 – 17
=> x = 3
$Vậy$ x = 3
b)
175 + ( 30 – x ) = 200
=> 175 + 30 – x = 200
=> 205 – x = 200
=> x = 205 – 200
=> x = 5
$Vậy$ x = 5
c)
10 + 2x = 4^5 : 4^3
=> 10 + 2x = 4^2
=> 10 + 2x = 16
=> 2x = 16 – 10
=> 2x = 6
=> x = 6 : 2
=> x = 3
$Vậy$ x = 3
d)
10x + 22. 5 = 102
=> 10x + 110 = 102
=> 10x = 102 – 110
=> 10x = -8
=> x = ( -8 ) : 10
=> x = – 4/5
$Vậy$ x = – 4/5