\(=29.\left(87-23\right)+64.71=29.64+64.71=64.\left(29+71\right)=64.100=6400\)
\(29.87-29.23+64.71\\ =29.\left(87-23\right)+64.71\\ =29.64+62.71\\ =\left(29+71\right).64\\ =100.64\\ =6400\)
5.23 + 35.41 + 64.65.a) 5.23 + 35.41 + 64.65.
= 5.23 + 5.7.41 + 5.64.13.= 5.23 + 5.7.41 + 5.64.13.
= 5.23 + 5.287 + 5.832.= 5.23 + 5.287 + 5.832.
= 5.(23 + 287 + 832).= 5.(23 + 287 + 832).
= 5.1142.= 5.1142.
= 5710.