(x+1)+(x+2)+(x+3)+....+(x+10)=155
(x+x+x+....+x)+(1+2+3+....+10)=155
10x + 55 =155
10x = 155 - 55
10x = 100
x=100 : 10
x = 10
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(x+1)+(x+2)+(x+3)+....+(x+10)=155
(x+x+x+....+x)+(1+2+3+....+10)=155
10x + 55 =155
10x = 155 - 55
10x = 100
x=100 : 10
x = 10
d/ khó lắm đó nha. ai biết minh tích
38/25 + 9/10 - 11/15 + 13/21 - 15/28 + 17/36 - ............. + 197/4851 - 199/4950.
2. ( x + 1 ) + ( x + 4 ) + ( x + 7 ) + ......... + ( x + 28 ) = 155
(X + 1) + (X + 4) + (X +7) +(X + 10) + . . . + (X + 28) = 155
(X + 1) + (X + 4) + (X +7) +(X + 10) + . . . + (X + 28) = 155
(x+1)+(x+4)+(x+4)+(x+7)+(x+10)+........+(x+28)=155
Tìm X : (X + 1) + (X + 4) + (X +7) +(X + 10) + . . . + (X + 28) = 155
Tìm X: (X + 1) + (X + 4) + (X +7) +(X + 10) + . . . + (X + 28) = 155
(x+1) + (x+4)+(x+7)+(x+10)+...+(x+28)=155
( x+1) + ( x+4 ) + ( x+7) +( x+ 10 ) + ... + ( x+ 28) = 155
( x + 1 ) + ( x + 4 ) + ( x + 7 ) + ( x+10 ) + ( x +13 ) = 155