sandy91
sandy91 sandy91
  • 03-05-2018
  • Mathematics
contestada

7×13 = 7 times parentheses blank +3 parentheses equals seven times blank parentheses +3×7×3 equals blank plus blank equals blank

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hallpatricia927 hallpatricia927
  • 04-05-2018
do what now? I don't understand the question
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pdix05 pdix05
  • 04-05-2018
the equation is 

7*13=7*(_+3)=7*(_)+3*7*3=_+_=_

the full equation is

7*13=7*(10+3)=7*(_)+3*7*3=50+41=91
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