Toán Lớp 6: a\ 75: ( x – 18 ) = 5^2b\ (27.x + 6 ) : 3 – 11 = 9 c\ ( 15 – 6x ). 3^5= 3^6 d\ ( 2x – 6) . 47 = 49 e/ 740:(x + 10) = 102 – 2.13
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Toán Lớp 6: a\ 75: ( x – 18 ) = 5^2b\ (27.x + 6 ) : 3 – 11 = 9 c\ ( 15 – 6x ). 3^5= 3^6 d\ ( 2x – 6) . 47 = 49 e/ 740:(x + 10) = 102 – 2.13
Giúp nhanh nha
Làm cho hết á
Làm ko hết=ăn báo cáo????
Comments ( 2 )
75: ( x – 18 ) = 25
x – 18 = 75: 25
x – 18 = 3
x = 3+18
x = 21
b) (27.x + 6 ) : 3 – 11 = 9
(27.x + 6 ) : 3 = 9+11
(27.x + 6 ) : 3 = 20
27.x + 6 = 20.3
27.x + 6 = 60
27.x = 60 – 6
27.x = 54
x = 54: 27
x = 2
c) ( 15 – 6x ). 3^5= 3^6
15 – 6x = 3^6: 3^5
15 – 6x = 3
6x = 15 – 3
6x = 12
x = 12: 6
x = 2
d) ( 2x – 6) . 47 = 49
2x – 6 = 49: 47
2x – 6 = 49/47
2x = 49/47+ 6
2x = 331/47
x = 331/47: 2
x = 331/94
e) 740:(x + 10) = 102 – 2.13
740:(x + 10) = 102 – 26
740:(x + 10) = 76
x + 10 = 740: 76
x + 10 = 185/19
x = 185/19 – 10
x = -5/19
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