(-4)(+6)(-7)
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(-4)(+6)(-7)(-4)(+6)(-7)(-4)(+6)(-7)原式=（-4）*（-7）*6=28*6=168(-4)(+6)(-7)=24*7=168168(-4)(+6)(-7)=98
(-4)(+6)(-7)
(-4)(+6)(-7)
(-4)(+6)(-7)
原式=（-4）*（-7）*6
=28*6
=168
(-4)(+6)(-7)
=24*7
=168
168
(-4)(+6)(-7)=98