(-4)(+6)(-7)
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(-4)(+6)(-7)
原式=（-4）*（-7）*6
=28*6
=168
(-4)(+6)(-7)
=24*7
=168
168
(-4)(+6)(-7)=98
4,5,6,7,
4 5 6 7
4 5 6 7
4、5、6、7,
4 5 6 7
4,5,6,7
4,5,6,7,
4,5,6,7
4,5,6,7
(-4)(+6)(-7)
4 6 7题,
4,5,6,7
4、5、6、7、
4 5 6 7
4 5 6 7
4,5,6,7
4 5 6 7
4,5,6,7
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