题目内容
19+28+37+46+55+64+73+82+91+______=550.
550-(19+28+37+46+55+64+73+82+91),
=550-[(19+91)+(28+82)+(37+73)+(46+64)+55],
=550-[440+55],
=550-440-55,
=55;
故答案为:55.
=550-[(19+91)+(28+82)+(37+73)+(46+64)+55],
=550-[440+55],
=550-440-55,
=55;
故答案为:55.
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