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x*2 + x*3 + x*4 + x*5 + x*6 = x*9 + 9999
=> x*(2 + 3 + 4 + 5 + 6) = x*9 + 9999
=> x*20 = x*9 + 9999
=> x*20 - x*9 = 9999
=> x*11 = 9999
=> x = 909
xx2 + xx3 +xx4+ xx5 + xx6 =xx9 + 9999
xx2 + xx3 + xx4 + xx5 + xx6 -xx9 = 9999
xx*10+2+ xx*10+3+xx*10+4+xx*10+5+xx*10+6-xx*10+9 = 9999
(xx*10+xx*10+xx*10+xx*10+xx*10-xx*10) + (2+3+4+5+6-9) = 9999
xx * (10+10+10+10+10-10) + 11 = 9999
xx*(10*5-10) = 9988
sai đề rồi
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18,2 - 9,84 : 4,8 + 1,85 = ?
18,2 - 2,05 + 4,8 = ?
16,15 + 4,8 = ?
=> ? = 20,95
nha
18,2 - 9,84 : 4,8 + 1,85
= 18,2 - 2,05 + 1,85
= 20,25 + 1,85
= 22 , 1
tk mk nha
hihi <3 nhiều ạ !
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\(x\cdot\frac{3}{2}+\frac{7}{2}\cdot x=2020\)
\(x\cdot\left(\frac{3}{2}+\frac{7}{2}\right)=2020\)
\(x\cdot5=2020\)
\(x=404\)
\(x:\frac{1}{3}+\frac{2}{3}=2\)
\(x\cdot3=2-\frac{2}{3}\)
\(x\cdot3=\frac{4}{3}\)
\(x=\frac{4}{9}\)
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A ) 1,85 x 27 + 1,85 x 9 + 185: 0,25 - 0,185 x 500 + 18,5
= 1,85 x 27 + 1,85 x 9 + 1,85 x 100 x 4 - 1,85 : 10 x 500 + 1,85 x 10
= 1,85 x 27 + 1,85 x 9 + 1,85 x 100 x 4 + 1,85 x 10 - 1,85 x 50
= 1,85 x 27 + 1,85 x 9 + 1,85 x 400 + 1,85 x 10 - 1,85 x 50
= 1,85 x ( 27 + 9 + 400 + 10 - 50 )
= 1,85 x 396
= 732,6
mk k chắc nha
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X x2+ Xx4=9,84
X x(2+4)=9,84
X x6=9,84
X=9,84:6
X=1,64
Xx3+Xx5=9,84
x.(3+5)=9,84
x.8=9,84
x=1,23
7xX-2xX=1,85
x(7-2)=1,85
x.5=1,85
x=0,37
Dấu . này là nhân nha
X x 3 + X x 5 = 9,84
X x ( 3 + 5 ) = 9,84
X x 8 = 9,84
X = 9,84: 8
X = 1,23
7 x X - 2 x X = 1,85
( 7 - 2 ) x X = 1,85
5 x X = 1,85
X = 1,85 : 5
X = 0,37
Chúc bạn học tốt