A) 44,6 + (53,5 +63,9) :10
\(=44,6+117,4\div10\)
\(=44,6+11,74\)
\(=56,34\)
B) 675 :45 -135:45
\(=\frac{1}{45}\times\left(675-135\right)\)
\(=\frac{1}{45}\times540\)
\(=12\)
C) 20,4 :24 +246:24
\(=\frac{1}{24}\times\left(20,4+246\right)\)
\(=\frac{1}{24}\times266,4\)
\(=11,1\)
CHÚC BN HỌC TỐT NHA!!!!