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tim x
(x+5,2)*2,1=23,1
x + 5,2 = 23,1 : 2,1
x + 5,2 = 11
x = 11 - 5,2
x = 5,8
\(\left(x+5,2\right)\times2,1=23,1\)
\(x+5,2=23,1\div2,1\)
\(x+5,2=11\)
\(x=11-5,2\)
\(x=5,8\)
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2017 x 89 + 1 chia 0,2 + 1 chia 0,5 + 1 chia 0,25 = 20,17 x mở ngoặc 89 + 5 + 2 + 4 đóng ngoặc bằng 20,17 x 100 = 2017
Bài làm
20,17 x 89 + 20,17 : 0,2 + 20,17 : 0,5 + 20,17 : 0,25
= 20,17 x 89 + 20,17 : \(\frac{1}{5}\) + 20,17 : \(\frac{1}{2}\) + 20,17 : \(\frac{1}{4}\)
= 20,17 x 89 + 20,17 x 5 + 20,17 x 2 + 20,17 x 4
= 20,17 x ( 89 + 5 + 2 + 4 )
= 20,17 x 3560
= 71805,2
# Học tốt #
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20,17 x 97 + 20,17 : 0,125 - 20,17 : 0,25 - 20,17
= 20,17 x 97 + 20,17 x 8 - 20,17 x 4 - 20,17 x 1
= 20,17 x ( 97 + 8 - 4 - 1 )
= 20,17 x 100
= 2017
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Xx101-X+72*99+72=21050
Xx100+72*99+72=21050
Xx100+7200=21050
Xx100=21050-7200
Xx100=13850
X=13850:100
X=138,5
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a) X x 1,5 - 5,7 = 3,3
X x 1,5 = 3,3 + 5,7
X x 1,5 = 9
x = 9: 1,5
x = 6
b) (X + 5,2) x 2,1 = 23,1
X +5,2 = 23,1 : 2,1
X + 5,2 = 11
x = 11- 5,2
x = 5,8
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x+(5,2) x2,1=23,1
x+(5,2)=23,1:2,1
x+(5,2)=11
x =11-5,2
x =5,8
tk nha bạn
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20,17 x 76,8 + 20,17 x 23,2 = 20,17 x (76,8 + 23,2)
= 20,17 x 100
= 2017