473加287减173加323简便运算?
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解:(1)473+245-173
=(473-173)+245
=300+245
=545
(2)327-175-125
=327-(175+125)
=327-300
=27
(3)698-(387+298)
=698-387-298
=(698-298)-387
=400-387
=13
(4)365+198
=365+200-2
=565-2
=563
(5)365-198
=365-(200-2)
=365-200+2
=163
(6)365-203
=365-(200+3)
=365-200-3
=165-3
=162
=(473-173)+245
=300+245
=545
(2)327-175-125
=327-(175+125)
=327-300
=27
(3)698-(387+298)
=698-387-298
=(698-298)-387
=400-387
=13
(4)365+198
=365+200-2
=565-2
=563
(5)365-198
=365-(200-2)
=365-200+2
=163
(6)365-203
=365-(200+3)
=365-200-3
=165-3
=162
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