X- 40% = 3,6
30×X+X=52
52 x 37 +26 x 26 - 40 x 58
=26x74+26x26-40x58
=26x100-100x23.2
=100x2.8
=280
X/40-x+4/52=2
Giải phương trình
\(\dfrac{x}{40}-\dfrac{x+4}{52}=2\)
\(\Rightarrow52x-40x-160=4160\Leftrightarrow12x=4320\Leftrightarrow x=360\)
Tìm x
a) 2x-(40-52)=x+12
b) 40-x=-12+3x
giúp mik vs,tks
a) 2x - ( 40 - 52 ) = x + 12
2x - 40 + 52 = x + 12
x = 0
b) 40 - x =-12 + 3x
4x = 52
x = 13
a) 2x - ( 40 - 52 ) = x + 12
2x - 40 + 52 = x + 12
x = 0
b) 40 - x =-12 + 3x
4x = 52
x = 13
tìm x(=quy tắc chuyển vế)
a) 2x-(40-52)=x+12
b) 40-x=-12+3x
giúp mik với,tks
Tính bằng cách thuận tiện nhất:
a) 27,3 x 0,25 x 40 =
b) 1,25 x 91,74 x 8 =
c) 37,58 x 75,6 + 62,42 x 75,6 =
d) 53,8 x 98 + 53,8 + 52 + 1,8 =
Tìm x biết:
a, 10 x + 2 2 . 5 = 10 2
b, 5 2 + 15 - x = 30
c, 2 2 . 5 2 - 25 + x = 40
d, 7 x 3 - 6 2 x = 13 . 2 3 - 26
a, 10 x + 2 2 . 5 = 10 2
10x = 100–20
10x = 80
x = 8
b, 5 2 + 15 - x = 30
15–x = 5
x = 10
c, 2 2 . 5 2 - 25 + x = 40
100–(25+x) = 40
25+x = 60
x = 35
d, 7 2 x - 6 2 x = 13 . 2 3 - 26
49x–36x = 104–26
13x = 78
x = 6
52>x*4>40
a,
52 x 378 + 49 x 387 - 387
b,
72 x 19 + 36 x 6 x 10 + 144 x 40 - 72 x 29
387×(52+49)-387
387×101-387
39087-387
38700
1368+216×10+576+2088
1368+2160+576-2088
3528+576-2088
4104-2088
2016
a/ 52.378+49.378-378
= 378 . (52+49 -1)
= 378 .100
= 37800
b/ 72 .19+36 .6.10+144 /40 -72.29
= 72 . 19 + 216 .10+576 .10 -72.29
= 72 .(19-29) +(216+576).10
= -72 .10 +792 .10
=720.10
= 7200
tính nhanh [(40/130 - 12/13 )x 40% + 0,15 ]chia -5/52
\(\left[\left(\frac{40}{130}-\frac{12}{13}\right)\times40\%+0,15\right]:\frac{-5}{52}\)
\(=\left[\left(\frac{4}{13}-\frac{12}{13}\right)\times\frac{40}{100}+\frac{15}{100}\right]:\frac{-5}{52}\)
\(=\left[\frac{-8}{13}\times\frac{2}{5}+\frac{3}{20}\right]\times\frac{-52}{5}\)
\(=\left[-\frac{16}{65}+\frac{3}{20}\right]\times\frac{-52}{5}=-\frac{5}{52}\times\left(-\frac{52}{5}\right)=1\)