`(4)/(7)-:(2)/(21)`

(-4)/(7)+(2)/(9)+(-5)/(4)+(8)/(21)

47-2+-(7)/(9)+(11)/(21)

Evaluate :(6)/(7)-2+(-7)/(9)+(19)/(21)

Evaluate : 6/7-2+(-7)/9+(19)/(21)

Show that {:[(4,1),(2,7)][(2,1),(3,4)] ne [(2,1),(3,4)][(4,1),(2,7)]

Find the inverses of the following matrices (if they exist) : (1) {:((1,3),(2,7)):}" "(2) {:((2,1),(7,4)):}" "(3) {:((1,-1),(2,3)):}" "(4) {:((3,-10),(2,-7)):}

Use the distributibity of multiplication of rational numbers over their addition to simplify: 2/7×(7/(16)-(21)/4) (ii) 3/4\× (8/9-40)