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b) 1,3-3/4×(-2 2/3)=1 3/10-3/4×(-2 2/3)=1 3/10-3/4×(-8/3)=1 3/10-(-2)=3 3/10
c) (-4 2/3)×1 2/7-2 5/7=(-14/3)×9/7-2 5/7=-6-2 5/7=-5 7/7-2 5/7=-8 2/7