1.

Add 4by7 2by3 -4by 21​

Answer»

ANSWER:

\bf  \frac{22}{<klux>21</klux>}  \\

Step-by-step EXPLANATION:

\frac{4}{<klux>7</klux>}  +  \frac{2}{<klux>3</klux>}  + ( -  \frac{4}{21} ) \\

L.C.M of 3, 7 and 21 is 21.

=  \frac{4 \times 3 + 2 \times 7 - 4 \times 1}{21}  \\  \\  =  \frac{12 + 14 - 4}{21} \\  \\  =  \frac{26 - 4}{21}  \\  \\  \bf =  \frac{22}{21}



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