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b. 2a × (-2) × ab² -4a2b2
c. 2a × 5ab × 3b = 30a2b2
d.a² × (-0,5)abc = 0,5a3bc
e. -¼ × x² × (-8)xy² = 2x3y2
f. 1/15x² × 5xy × 6xy² = 2x3y3