简算(必须)1992×198.9-1991×198.8=?
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![简算(必须)1992×198.9-1991×198.8=?](/uploads/image/z/9290048-32-8.jpg?t=%E7%AE%80%E7%AE%97%28%E5%BF%85%E9%A1%BB%291992%C3%97198.9-1991%C3%97198.8%3D%3F)
简算(必须)1992×198.9-1991×198.8=?
简算(必须)
1992×198.9-1991×198.8=?
简算(必须)1992×198.9-1991×198.8=?
1992×198.9-1991×198.8
=(1991+1)×198.9-1991×(198.9-0.1)
=1991×198.9+198.9-1991×198.9+199.1
=398
1992×198.9-1991×198.8
=(1991+1)×(198.8+0.1)-1991×198.8
=1991×198.8+1991×0.1+1×198.8+0.1-1991×198.8
=1991×0.1+1×198.8+0.1
=199.1+198.9
=398
1992×198.9-1991×198.8
=(1991+1)×198.9-1991×(198.9-0.1)
=1991×198.9+198.9-1991×198.9+199.1
=398