Toán Lớp 6: (-15) + x + (-4) = 0
15 – 2(x – 1) = -3 100 – x – 2x – 3x – 4x = 90
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Toán Lớp 6: (-15) + x + (-4) = 0
15 – 2(x – 1) = -3 100 – x – 2x – 3x – 4x = 90
Comments ( 2 )
-19 +x = 0
⇒ x = 19
Vậy x= 19
b) 15 – 2(x – 1) = -3
15 – 2x + 2 = -3
17 – 2x = -3
– 2x = -3 -17
– 2x = – 20
⇒ x = (-20) : (-2) = 10
Vậy x =10
c) 100 – x – 2x – 3x – 4x = 90
100 – 10x = 90
– 10x = 90 – 100
– 10x = -10
x = (-10) :(-10)
x =1
Vậy x = 1
Chúc bạn học tốt!!
(-15)+x=0+(-4)
(-15)+x=-4
x=-4-(-15)
x=11
15-2(x-1)=-3
2(x-1)=15-(-3)
2(x-1)=18
x-1=18:2
x-1=9
x=9+1
x=10
100-x-2x-3x-4x=90
100-10x=90
10x=100-90
10x=10
x=10:10
x=1