2x-5=19
=>2x = 19+5
=>2x =24
=>x =24:2
=>x =12
\(2x-5=19 \)
\(2x=19+5\)
\(2x=24\)
\(X=24÷2\)
\(X= 12\)
C1.10x2=6x+8
C2.23x+10=23+13x
C3.9x-6=4x+1
C4.15x-12=11x+15
C5.21x+9=19-11x
C6.15+16x=8-3x
C7.19-4x=8x+23
C8.51-10x=3x-21
C9.8-6x=11-4x
C10.2(3x+4)-3(1-2x)=8x+10
C11.5(3-4x)-4(2x-5)=9-10x
C12.3(5x-6)-2(2x-5)=11x-10
C13.10x+5(3x-2)=25-10x
C14.6(2x-3)+3(3-5x)=8x-9
C15.3(4x-2)+2(6-2x)=10-6x
C16.5(3-6x)-4(2-2x)=4x-9
B2:tìm cặp số nguyên x, y thỏa mãn
X y+2x+y=0
1.tìm x biết
a,15-(3+x)+2x=19
b,(-58)-(19-58-x)=60
c,2(x-4)-3(x+5)=4
d,(2-3x)+(x-3)=(5x-1)-(5x-2)
2.Tính nhanh
a,A= -3752-(29-3632)-51
b,B=3542-(674-798)-(326+2798)
( 1890 - 19 - 5 ) - ( 19 - 5 -+1890 )
B1
X+18=6-2x
X+15=20-4x
-12+x=5x-20
17-x=7-6x
7x-4=20+3x
4x-18=x+27
B2
2(x-5)-3(x+7)=14
-7(5-x)-2(x-10)=15
4(x-5)-(x+7)=-19
5(x-6)-2(x+3)=12
3(x-4)- (8-x)=12
7(x-3)-5(3-x)=11x-5
B3
J=6+16+.....+19600+19998
K=2+5+9+....+4949+5049
F=1.3+2.3+3.5+ .... +2013+2015
N=1+52+53+....+5100
a) 19 . 25 + 19 . 16 + 41
b) (-8) . 72 + 8 . (-19)- (-8)
c) 28 +(19 - 28 ) - ( 32 - 57)
d) 101 + (- 60) + 29 + (- 40)
Tìm x€ Z, biết :
4.(x-5)-(x+7)=-19
Giúp mình vs mình cần gấp lắm!!!!!
(2x + 7) – 25 = 14
b) 87 – (321 – x) : 5 = 3.52
c) 3
1 tính
a -20.(-15).3
b (-12). (-17).(-8).5
2 so sánh Avà B
A= 5. 73 . (-8). (-9). (-1).11.(-10)
B= (-2). (357).29 . (-8).(-72)
3 tìm x , y thuộc Z
a 2x -5 = 15
b x. (x-5 ) = 0
c (3-x ) . (y + 2 ) =0
d xy -2x - y +2 = 0
e (x -1 )^4 +(y + 2 )^2018=0
d | 2x + 10 | +|3y -9 | = 0
THÂN ÁI !
