l25X40X8X25简便 30lXl8一l8 （l0十2）X25 78X45十56X78一78

Question

如题所述

Answer 1

l25X40X8X25
=125*8*40*25
=1000*1000
=1000 000
30lXl8一l8
=18(301-1)
=18*300
=5400
（l0十2）X25
=10*25+2*25
=250+50
=300
78X45十56X78一78
=78(45+56-1)
=7800追答

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Answer 2

125×40×8×25=125×8×4×25=1000×100=100000
301×18-18=（301-1）×18=300×18=5400
（10+2）×25=10×25+2×25=250+50=300
78×45+56×78-78=78×（45+56-1）=78×100=7800