一道关于有理数的乘除法的初一题目
已知:1+2+3……+33=17x33
计算 1-3+2-6+3-9+4-12+……+31-93+32-96+33-99
希望把过程些详尽点
人气:450 ℃ 时间:2020-06-15 11:21:35
解答
1-3+2-6+3-9+4-12+……+31-93+32-96+33-99
=1+2+3+……+33-(3+6+9+……99)
=17x33-3×(1+2+3+4+……+33)
=17×33-3×17×33
=-1122
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