99.9×98+(0.8-3/5)×999,3/5是五分之三
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99.9×98+(0.8-3/5)×999,3/5是五分之三
99.9×98+(0.8-3/5)×999,3/5是五分之三
99.9×98+(0.8-3/5)×999,3/5是五分之三
99.9×98+(0.8-3/5)×999
=99.9×98+0.2×999
=999×9.8+999×0.2
=999×(9.8+.0.2)
=9990
您的问题已经被解答~(>^ω^
99.9×98+(0.8-3/5)×999
=99.9×98+0.2×999
=999×9.8+999×0.2
=999×(9.8+.0.2)
=9990
原式=999*9.8+0.2*999
=999*(9.8+0.2)
=999*10
=9990
999*9.8+0.2*999
999*(9.8+0.2)=9990
原式=(100-0.1)×98+(0.8-0.6)×(1000-1)
=9800-9.8+200-0.2
=10000-10
=9990
99.9×98+(0.8-3/5)×999
=(100-0.1)+(100-2)+0.2×999
=10000-200-10+0.2+0.2×999
=9790+0.2×(1+999)
=9790+200
=9990
(100-0.1)×98+(0.8-0.6)×(1000-1)
=9800-9.8+0.2×(1000-1)
=9800+200-9.8-0.2
=10000-10
=9990
(100-0.1)*(100-2)+(0.8-0.6)*(1000-1)=10000-210+0.2+0.2*1000-0.2=10000-210+200=9990
999*(0.1*98+0.8-0.6)=999*(9.8+0.2)=9990