Toán Lớp 7: tìm x
(2x -3). 25 = -125
2x + 7 = -13
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Toán Lớp 7: tìm x
(2x -3). 25 = -125
2x + 7 = -13
Comments ( 2 )
(2x – 3) * 25 = -125
2x – 3 = -125 : 25
2x – 3 = -5
2x = -5 + 3
2x = -2
x = -2 : 2
x = -1
Vậy x = -1
_________________________
2x + 7 = -13
2x = -13 – 7
2x = -20
x = -20 : 2
x = -10
Vậy x = -10
(2x-3).25=-125
=>2x-3=(-125):25
=>2x-3=-5
=>2x=-5+3
=>2x=-2
=>x=(-2):2
=>x=-1
Vậy x=-1
2x+7=-13
=>2x=-13-7
=>2x=-20
=>x=(-20):2
=>x=-10
Vậy x=-10.