Toán Lớp 6: tìm x , biết :
a) 6x – 5 = 19
b) 3x = 2 = 20 + (-12)
c) 12x – 33 = 3 ³ . 3 ³
d) (x + 1 ) + ( x + 2 ) + …+ (x + 100) = 5750
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Toán Lớp 6: tìm x , biết :
a) 6x – 5 = 19
b) 3x = 2 = 20 + (-12)
c) 12x – 33 = 3 ³ . 3 ³
d) (x + 1 ) + ( x + 2 ) + …+ (x + 100) = 5750
Comments ( 2 )
⇔(x+x+x…+x)+(1+2+3+…+100)=5750
⇔(x.100)+(1+100).100:2=5750
⇔(x.100)+5050=5750
⇔x.100=5750-5050
⇔x.100=700
⇔x=700:100
⇔x=7
⇔(x+x+x…+x)+(1+2+3+…+100)=5750
⇔(x.100)+(1+100).100:2=5750
⇔(x.100)+5050=5750
⇔x.100=5750-5050
⇔x.100=700
⇔x=700:100
⇔x=7