Câu hỏi của mình đây .
30, 5 ( x - 12, 5 ) = 12, 2
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Ai nhanh nhất mình tíc.
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14 tháng 5 2022
a: =11/4+5/4-9/8
=4-9/8=32/8-9/8=23/8
b: \(=\dfrac{6}{7}\cdot\dfrac{7}{4}+\dfrac{5}{3}=\dfrac{3}{2}+\dfrac{5}{3}=\dfrac{9+10}{6}=\dfrac{19}{6}\)
c: \(=\dfrac{13}{18}\cdot\dfrac{9}{5}-1=\dfrac{13}{10}-1=\dfrac{3}{10}\)
d: \(=3+\dfrac{9}{4}\cdot\dfrac{5}{3}=3+\dfrac{45}{12}=\dfrac{81}{12}=\dfrac{27}{4}\)
1 tháng 11 2016
17 k nha
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1 tháng 2 2017
-12(x - 5) + 7(3 - x) = 5
<=> -12x + 60 + 21 -7x = 5
<=> -19x +81 = 5
<=> -19x = -76
<=> x = 76 : 19
<=> x = 4
1 tháng 2 2017
7.trị tuyệt đối của 2x-3 = 49
<=> trị tuyệt đối của 2x - 3 = 49 : 7 = 7
<=>2x - 3 = 7
=> 2x = 7 + 3 = 10
=> x = 10 : 2 = 5
hoặc 2x - 3 = -7
=> 2x = -4
=> x = -4 : 2 = -2
26 tháng 3 2022
a) x : 1/4 = 7/5
x = 7/5 x 1/4
x = 7/20
b) 9/2 - x = 3/5
x = 9/2 - 3/5
x = 39/10
c) 12/5 : x = 7/2
x = 12/5 : 7/2
x = 24/35
30, 5 ( x - 12, 5 ) = 12, 2
x - 12,5 = 12,2 : 30,5
x - 12,5 = 0,4
x = 0,4 + 12,5
x = 12,9
bn ơi thiếu dấu + - x : sau 30,5