tìm x
a,(x + 74) – 318= 200
b,3636 : (12x – 91) = 36
c,(x : 23 + 54) x 67 = 8911
d,2x + 225 + 3x = 1000
e,(x + 1) + (x + 2) + …. + (x + 99) = 90387
giúp mình ik mn
tìm x
a,(x + 74) – 318= 200
b,3636 : (12x – 91) = 36
c,(x : 23 + 54) x 67 = 8911
d,2x + 225 + 3x = 1000
e,(x + 1) + (x + 2) + …. + (x + 99) = 90387
giúp mình ik mn
a) (x + 74) – 318 = 200
(x + 74) = 200 + 318
(x + 74) = 518
x = 518 – 74
x = 444
b) 3636 : (12x – 91) = 36
(12x – 91) = 3636 : 36
(12x – 91) = 101
12x = 101 + 91
12x = 192
x = 192 : 12
x = 16
c) (x : 23 + 54) x 67 = 8911
(x : 23 + 54) = 8911 : 67
(x : 23 + 54) = 133
x : 23 = 133 – 54
x : 23 = 79
x = 79 x 23
x = 1817
bn vote cũng đc, ko cũng đc
a, (x+74)-318=200
⇔ x+74=200+318
⇔ x+74=518
⇔ x=518-74
⇔ x=444
b, 3636:(12x-91)=36
⇔ 12x-91=3636:36
⇔ 12x-91=101
⇔ 12x=101+91
⇔ 12x=192
⇔ x=192:12
⇔ x= 16
c, (x:23+54).67=8911
⇔ x:23+54=8911:67
⇔ x:23+54=133
⇔ x:23=133-54
⇔ x:23=79
⇔ x= 79.23
⇔ x=1817
d, 2x+225+3x=1000
⇔ 5x+225=1000
⇔ 5x=775
⇔ x=155
e, (x+1)+(x+2)+…+(x+99)=90387
⇔ (x+x+…+x)+(1+2+…+99)=90387
⇔ 99x+99.100/2=90387
⇔ 99x+4950=90387
⇔99x=90387-4950
⇔ 99x=85437
⇔ x=85437:99
⇔ x=863
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