15. 12 *(-5) =-65 x 12 ) = -6
16.-14 x 4= -(_ _x H ) = -5
17.-23 x 42 = (-42) x 23 .
18. (-43) + 0 = - 43.
19.(-9) × 20 = -180 .
20. (-6) + (-6) + (-6) = _ _*(-6).
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20.(-6)+(-6)+(-6)=3×(-6)
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