要五道
人气:233 ℃ 时间:2020-06-19 11:33:49
解答
1.-3x(-y-xyz)
2.-9*(-11)-12*(-8)
3.(1/3-5/7-2/5)*105
4.23a3bc2-15ab2c+8abc-24a3bc2-8abc
5.-7x2+6x+13x2-4x-5x2
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