解:(1)原式=16﹣29+7﹣11
=23﹣40
=﹣17.
(2)原式=﹣1﹣6﹣7=﹣14.
(3)原式=﹣25﹣(﹣﹣)×24
=﹣25﹣28+8+9
=﹣36.
(4)原式=9﹣[﹣5+(1﹣)×(﹣)]
=9﹣[﹣5+(﹣)]
=9+5+=14.
(5)原式=9a2﹣2a+7a2﹣a2+3a
=15a2+a.
(6)原式=x2y﹣(5xy2﹣2x2y+6xy2)
=x2y﹣5xy2+2x2y﹣6xy2
=3x2y﹣11xy2.
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