作业帮99*98+198怎么简算
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99*98+198怎么简算
99*98+198怎么简算
99*98+198怎么简算
=（100-1）*98+198
=9800-98+198
=9800+198-98
=9800+100
=9900
原式=99*98+99*2
=99*（98+2）
=99*100
=9900
(100-1)×98+98=9800-98+198=9900
(100-1)(100-2)+(200-2)
=(100-1)(100-2)+2(100-1)
=(100-1)(100-2+2)
=99*100
=9900
99*98+198
=99*98+99*2
=99*(98+2)
=99*100
=9900
99*98+198=(1+99)*98+100=9800+100=9900
99*98+99*2=99*(98+2)=99*100+9900
99*98+198=99*98+2*99=99*100
99*8 = 792
+99*9 = 891
= 9702
+ 198
= 9900
99*98+100+98
=(99+1)*98+100
=9800+100
=9900
99*98+198
=99*98+98+100
=（99+1）*98+100
=100*98+100
=9900
原式=99×98+100+98×1
=98（99+1）+100
=98×100+100
=100×(98+1)
=9900