(120-30.4):(1+2+3+4+5)
=(120-120):15
=0:15
=0
(120-30x4):(1+2+3+4+5)
=(120-120):15
=0:15
=0
b) \(\left(120-30\times4\right):\left(1+2+3+4+5\right)\)
\(=\left(120-120\right):\left(3+7+5\right)\)
\(=0:15\)
\(=0\)
(120 - 30 : 4) : ( 1 + 2 + 3 + 4 + 5) =
(120 - 120) : 15 =
0 : 15 = 0
b) (120−30×4):(1+2+3+4+5)(120−30×4):(1+2+3+4+5)
=(120−120):(3+7+5)=(120−120):(3+7+5)
=0:15=0:15
=0