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99乘99加199怎样简便运算

99x99+199 =99x99+99+100 =99x(99+1)+100 =99x100+100 =100x(99+1) =100x100 =10000

99*99+199 =99*99+99+100 =99*100+100 =100*100 =10000

99X999+199 =99X999+100+99 =99X(999+1)+100 =99X1000+100 =99000+100 =99100

99+999+199 = 97+1000+200 = 1297

99×99+199 =99×99+99+100 =(99+1)×99+100 =100×99+100 =100×(99+1) =100×100 =10000

等于100乘299加199减299

=200x1999-1999x199.8 =1999x(200-199.8) =1999x0.2 =(2000-1)x0.2 =400-0.2 =399.8

99+199+1999+3 =(99+1)+(199+1)+(1999+1) =100+200+2000 =2300

542+199+99 =540+(199+1)+(99+1) =540+200+100 =840

=99……9(1992个9)×【99……9(1992个9)+1】 =99……9(1992个9)×【(10的1992次方-1)+1】 =99……9(1992个9)×10的1992次方 =99……9(1992个9)00……0(1992个0)

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