Упростить выражения: а)-а*(-b) б)5x*(-6b). Created by ddjjckdh. matematika-ru

Упростить выражения: а)-а*(-b) б)5x*(-6b)...

ddjjckdh @ddjjckdh

July 2022 2 12 Report

Упростить выражения:
а)-а*(-b)
б)5x*(-6b)

physicsonelove

Verified answer

A) -a*(-b) = a*b
б) 5x*(-6b) = -30bx

1 votes Thanks 1

NNNLLL54

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$-a\cdot (-b)=-1\cdot a\cdot (-1)\cdot b=(\underbrace {-1\cdot (-1)}_{+1})\cdot ab=+ab\\\\\\5x\cdot (-6b)=5\cdot x\cdot (-6)\cdot b=(\underbrace {-6\cdot 5}_{-30})\cdot bx=-30\cdot bx=-30\, bx\\\\\\P.S.\; \; -c=-1\cdot c\\\\(-1)\cdot (+1)=(+1)\cdot (-1)=-1\\\\(-1)\cdot (-1)=+1\\\\(+1)\cdot (+1)=+1$

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