Simplify : `126xx55+126xx45`

Simplify 423xx55+423xx45 .

Simplify: (155\ xx\ 155\ xx\ 155-55\ xx\ 55\ xx\ 55)/(155\ xx\ 155+155\ xx\ 55+55\ xx\ 55)

Simplify 117 + 9 xx 5 - 3 xx 8 + 55 xx 55 + 8 xx 7 + 6

Simplify : ((3)/(5) xx (-15)/(21)) +((-9)/(14) +(45)/(28)) -((2)/(3) xx (30)/(12))

Simplify : (((2)/(3)xx (-(5)/(4)))+((-(10)/(3)) xx (5)/(2))-(((-16)/(3))xx(-(55)/(32))))/((3)/(2)xx((-(9)/(14))xx(-(1)/(7))))

Q. 103 to 126

Simplify the expressions : 45 div 5 + 20 xx 4 - 12