= 65 x ( 121 + 11) - 35 x ( 17 + 115 )
= 65 x 132 - 35 x 132
= ( 65 - 35) x 132
= 30 x 132
= 3960
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\(65\cdot121-35\cdot17+11\cdot65-115\cdot35\)
\(=65\cdot\left(11+121\right)-35\cdot\left(115+17\right)\)
\(=65\cdot132+35\cdot132\)
\(=132\cdot\left(65+35\right)\)
\(=132\cdot100\)
\(=13200\)
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