(x+1)+(x+4)+(x+7)+….+(x+28)=185,求x
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(x+1)+(x+4)+(x+7)+….+(x+28)=185,求x(x+1)+(x+4)+(x+7)+….+(x+28)=185,求x(x+1)+(x+4)+(x+7)+….+(x+28)=185,
(x+1)+(x+4)+(x+7)+….+(x+28)=185,求x
(x+1)+(x+4)+(x+7)+….+(x+28)=185,求x
(x+1)+(x+4)+(x+7)+….+(x+28)=185,求x
一共有10项
将式子展开得10x+1+4+...+28=185
而1+4+...+28=(1+28)*10/2=145
所以
10x+145=185
10x=40
x=4
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(x+1)+(x+4)+(x+7)+….+(x+28)=185,求x
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