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How about 300 recursive equations in the second volume of the fourth grade?
According to the operation sequence, the calculation process is expressed by equations in turn.

( 1)485 - ( 6 × 4 + 32 )

= 485 - ( 24 + 32 )

= 485 - 56

= 429

(2) 1000 - ( 500 + 499 + 1 )

= 1000 - 1000

= 0

(3)365 1 × { 452 - [ 52 + ( 500 - 100 ) ] }

= 365 1 × { 452 - [ 52 + 400 ] }

= 365 1 ×{ 452 - 452 }

= 365 1 × 0

= 0

(4)56× 125+8

=7000+8

=7008

(5)32×(25+ 125)

=4×8×(25+ 125)

=4×8×25+8× 125×4

=800+4000

=4800