如题所述
(1)
199+19.9+1.99+0.199
=200+20+2+0.2-1-0.1-0.01-0.001
=(200+20+2+0.2)-(1+0.1+0.01+0.001)
=222.2-1.111
=221.089
(2)
243.25+543.25+743.25+943.25
=200+500+700+900+43×4+0.25×4
=2300+172+1
=2473
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第1个回答 2013-08-25
199+19.9+1.99+0.199
=200+20+2+0.2-1.111
=222.2-1.111
=221.089
243.25+543.25+743.25+943.25
=240+540+740+940+3.25x4
=780+1680+14
=780+20-6+1680
=2480-6
=2476本回答被提问者采纳
=200+20+2+0.2-1.111
=222.2-1.111
=221.089
243.25+543.25+743.25+943.25
=240+540+740+940+3.25x4
=780+1680+14
=780+20-6+1680
=2480-6
=2476本回答被提问者采纳
