(4+7+10+ ...+28)\9-(2+5+8+...+26)\9
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(4+7+10+ ...+28)\9-(2+5+8+...+26)\9
(4+7+10+ ...+28)\9-(2+5+8+...+26)\9
(4+7+10+ ...+28)\9-(2+5+8+...+26)\9
(4+7+10+ ...+28)÷9-(2+5+8+...+26)÷9
=(4-2+7-5+10-8+……+28-26)÷9
=2×9÷9(这里的9表示一共有9项)
=2
你好!
(4+7+10+ ...+28)\9-(2+5+8+...+26)\9
=[(4+7+10+ ...+28)-(2+5+8+...+26)]/9
=(4-2+7-5+···+28-26)/9
=(2+2+2···+2)/9 (共有9个2)
=2×9/9=2
(4+7+10+ ...+28)\9-(2+5+8+...+26)/9
=[(4+7+10+ ...+28)-(2+5+8+...+26)]/9
=[(4-2)+(7-5)+(10-8)+...+(28-26)]/9
=[2+2+2...+2]/9
=[2×9]/9
=2
=2
原式={(4-2)+(7-5)+……+(28-26)}/9=2*9/9=2
[(4+7+10+ ...+28)-(2+5+8+...+26)] \9
(4+7+10+ ...+28)\9-(2+5+8+...+26)\9
=(4-2+7-5+``````25-23+28-26)\9
=2x(28-1)\3\9
=2x27\27
=2
原式=(4-2+7-5+10-8+…+28-26)/9
=2