-3(2S-5)怎么去括号?

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-3(2S-5)怎么去括号?-3(2S-5)怎么去括号?-3(2S-5)怎么去括号?-3(2S-5)=(-3)×2S+(-3)×(-5)=-6S+15-6S+15-6S+15-3(2S-5)=-6S+

-3(2S-5)怎么去括号?
-3(2S-5)怎么去括号?

-3(2S-5)怎么去括号?
-3(2S-5)
=(-3)×2S+(-3)×(-5)
=-6S+15

-6S+15

-3(2S-5)=-6S+15