( x + 1 ) + ( x + 4 ) + ( x+7 ) + ......+ ( x + 28 )
= (x + x + x + .... + x ) + (1 + 4 + 7 + .... + 28)
= 10x + 145
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( x + 1 ) + ( x + 4 ) + ( x+7 ) + ......+ ( x + 28 )
( x + 1 ) + ( x + 4 ) + ( x+7 ) + ......+ ( x + 28 )
(x +1)+ (x=4)+(x+7)+...+(x+28)=155
(x+1)+(x+4)+(x+7)+.....+(x+28)=115
( x + 1 ) + ( x + 4 ) + ( x + 7 ) + ........... + ( x + 28 ) = 156
tim x biet (x+1) + (x+4)+(x+7)+...+(x+28) = 156
A, (X+1)+(x+4)+(x+7)+...+(x+25)+(x+28)=155
b,(x+9)+(x-2)+(x+7)
+(x-4)+(x+5)+(x-6)+(x+3)+(x-8)+(x+1)=95
Tìm x
( x + 1 ) + ( x + 4 ) + ( x+7 ) + ......+ ( x + 28 )
X x 1 +1 + X x 2 + 4 +X x 3+ 7 + ....+(X x 11 + 28)=239