\(4x-20=2^2\)
\(4x=4+20\)
\(4x=24\)
\(x=6\)
4x−20=224x−20=22
4x=4+204x=4+20
4x=244x=24
x=6x=6
Tìm x, biết:
a, 70 - 5 ( x - 3 ) = 45
b, 10 + 2 x = 4 5 : 4 3
c, 60 - 3 x - 2 = 51
d, 4 x - 20 = 2 5 : 2 3
x25 = 4x23
20+21+22+.....+29+30=
=(20+30)+(21+....)+(22+.....)+(23+.....)+(24+....)+25
=50........+25
18- 4x = -20-6x
h)-15 x 24 = - 7x +32
i) 15x- 3(4x - 6) = - 12+ 36
k) -10 x - 27 = - 7x +33
m) -17 x - 24 = - 9x - 40
n) -23 x 25 = - 18x +75
p) - 5x+ 7( 2x-3) = 4( x - 4)
q)24- 6(3x + 1) = -5( 4x- 4 ) - 8
r) 18-4. (6-2x) = -3.(4x +5 ) - 11
Jup mik pls
tinh nhanh s= 20*21+22*23+23*24+24*25+...+39*40
So sánh: 20\21; 21\22; 22\23; 23\24; 24\25
20180 - ( 152 : ( 20 . 15 - 23 . 52 ) - 25 )
tinh nhanh
3) (187 -23) – (20 – 180)
4) (-37 – 17). (-9) + 35. (-9 – 11)
5) (-50 +19 +143) – (-79 + 25 + 48)
6) (-8).25.(-2). 4. (-5).125
7) 3784 + 23 – 3785 – 15
tinh nhanh
3) (187 -23) – (20 – 180)
4) (-37 – 17). (-9) + 35. (-9 – 11)
5) (-50 +19 +143) – (-79 + 25 + 48)
6) (-8).25.(-2). 4. (-5).125
7) 3784 + 23 – 3785 – 15
20+21+23+24+25+26+27+28+29+30
