1x+2x+3x+4x+.........+100x=10100
<=>100x+(1+2+3+4+...+100)=10100
<=>100x+5050=10100
<=>100x=5050
<=>x=100/2
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tìm số tự nhiên x biết : x+2x+3x+4x+...+100x = 10100
tìm x thuộc N biết : x + 2x + 3x +...+100x =10100
a) 2x+48=60
b)3.(x+5)+8=80
c)2x+3x=50
d)x+2x+3x+.........+99x+100x=10100
e)x.(x+2)=0
BÀI 1:Tìm x biết
a :3x -5 =x
b: 1.2.3.4.5......(x+1)=0
c:x+ 2x +3x +4x +5x+..............+100x=0
d:x +2x+3x+4x+5x+..................+100x=5050
e:(x+1)+(x+2) +(x+3) +(x+4)+............+(x+100)= 5050
Tìm x biết x+2x+3x+4x+...+100x=5050
tìm x
x+2x+3x+4x+.....+100x=151500
B1: 48:(2x+6)+2014=2017
B2:x+2x,...,100x=10100
Tim x c N biet :
a/ ( x + 1 ) + ( x + 2 ) + ( x + 3 ) ..... + 50x = 1275
b/ x + 2x + 3x + .... + 100x = 10100
giup minh nha! minh tick cho !
Tim x c N, biet :
a/. ( x + 1) + ( x + 2 ) + ( x + 3 )......+ 50x = 1275
b/. x + 2x + 3x +...... + 100x = 10100
giup minh nhe minh se tick cho !!!