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a) x +60+40 =400
x = 400-40-60
x =300
b) (x+25) + 50 = 100:2 +30
(x+25) +50 = 50+30=80
x+25 = 80-50=30
x =30-25
x = 5
a.x+60+40=200
x+100=200
x=200-100
x=100
b.x+25+50=100:2+30
x+75=50+30
x+75=80
x=80-75
x=5
mk nhanh nhất
a) 12 < 6x < 30
=> 6.2 < 6x < 6.5
=> 2<x<5
=> x = 3 hoac x = 4
b) 30:5 < 6x < 24
=> 6 < 6x < 6.4
=> 1<x<4
=> x = 2 hoac x = 3
a) x + 100 = 50 + 60
x + 100 = 110
x = 110 - 100
x = 10
b) x + 50 = 30 + 60
x + 50 = 90
x = 90 - 50
x = 40
_______________________________________________THE END_____________________________________________________
10+20+30+40+50+60+70+80+90+100
=(10+100)+(20+90)+(30+80)+(40+70)+(50+60)
= 110+110+110+110+110
=110x5
=550
a,30 + x = 50
x=50 - 30
x = 20
b, 100 - x = 90
x = 100 - 90
x = 10
^^
a, 30 + x = 50
x = 50 - 30= 20
b, 100 - x = 50
x = 100 - 50 = 50
a, 30 + x = 50
=> x = 50 - 30
=> x = 20
b, 100 - x = 90
=> x = 100 - 90
=> x = 10
làm lại b nhá,
100 - x = 90
x = 100 - 90
x = 10
a, x=20
b, x=10
a, 30 + x = 50
x = 50 -30
x = 20
b, 100 - x = 90
x = 100 -90
x= 10
a,30+x=50 b,100-x=90
x=50-30 x=100-90
x=20 x=10
a,30 + x = 50
x = 50 - 30
x = 20
b,100 - x = 90
x = 100 - 90
x =10
Nhé bn ^_^ kb với mình nha
a)30+x=50
x=50-30
x=20
b)100-x=90
x=100-90
x=10
a , 30 + x = 50
x = 50 -30
x = 20
b, 100 - x = 90
x = 100 -90
x = 10
a, x=20
b,x=10
30 + x = 50
x = 20
100 - x = 90
x = 10
a, 30 + x = 50
x = 50 - 30
x = 20
Vậy x = 20
b, 100 - x = 90
x = 100 - 90
x = 10
Vậy x = 10
a) 30 + x = 50
=> x = 50 - 30
=> x = 20
Vậy x = 20
b) 100 - x = 90
=> x = 100 - 90
=> x = 10
Vậy x = 10
30+x=50 100-x=90
x=50-30 x=100-90
x=20 x=10
a) 30 + x = 50
x = 50 - 30
x = 20
b) 100 - x = 90
x = 100 - 90
x = 10
a, x = 50 - 30 = 20
b, x = 100 - 90 = 10
a) x=20
b)x=10
a) 30 + x =50
x =50 - 30
x = 20
b) 100 - x = 90
x = 100 - 90
x = 10
a) x=20
b)x=10
a)30+x=50 b)100-x=90
x = 50-30 x = 100-90
x =20 x = 10
x= 50-30
x= 20
b,x=100-90
x=10
a) 30 + x = 50 b) 100 - x = 90
x = 50 -30 x = 100 - 90
x = 20 x = 10
a30+x=50
x=50-30
x=20
b 100-x=90
x=100-90
x=10
a, 30+x = 50
= 50-30
= 20
b, 100-x = 90
= 100-90
= 10
a, x= 20
b, x=10
cau1:x=20 cau 2:10