简便方法计算:(1)1998+998+98=(2)43+40+39+41+37+42=
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简便方法计算:
(1)1998+998+98=
(2)43+40+39+41+37+42=
(1)1998+998+98=
(2)43+40+39+41+37+42=
![简便方法计算:(1)1998+998+98=(2)43+40+39+41+37+42=](/uploads/image/z/5058473-41-3.jpg?t=%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%881%EF%BC%891998%2B998%2B98%3D%EF%BC%882%EF%BC%8943%2B40%2B39%2B41%2B37%2B42%3D)
(1)1998+998+98,
=2000+1000+100-6,
=3100-6,
=3094;
(2)43+40+39+41+37+42,
=(43+37)+(39+41)+(40+42),
=80+80+82,
=242.
=2000+1000+100-6,
=3100-6,
=3094;
(2)43+40+39+41+37+42,
=(43+37)+(39+41)+(40+42),
=80+80+82,
=242.
简便方法计算:(1)1998+998+98=(2)43+40+39+41+37+42=
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