45 x 77 + 9 x 22 x 5 + 45
= 45 x 77 + 45 x 22 + 45
= 45 x (77 + 22 + 1)
= 45 x 100
= 4500
k mik nhé
\(45x77+9x22x5+45\)
\(=45x77+45x22+45\)
\(=45x\left(77+22+1\right)\)
\(=45x100\)
\(=4500\)
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