3a^2-[6a-(4a-3)-2a^2]
人气：498 ℃ 时间：2020-01-29 16:37:29
解答
原式=3a^2-[6a-4a+3-2a^2]
=3a^2-[2a+3-2a^2]
=3a^2-2a-3+2a^2
=5a^2-2a-3
去括号是从里往外一层一层地去
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