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6.5+9.99简便运算

9.5-6.99 =9.5-7+0.01 =2.5+0.01 =2.51

6.5x79+6.5简便运算 =6.5x(79+1) =6.5x80 =520

用简便方法计算5.7×99-6.8×99 9.9 5.7×99-6.8×99 9.9 =9.9*(5.7-6.8+1) =-9.8*0.1 =-0.98

9.56乘99加9.56 =9.56x99+9.56 =9.56x(99+1) =9.56x100 =956

7+4x999+4+99x5+5+9x6+6 =7+4*(1000-1)+4+(100-1)*5+5+(10-1)*6+6 =7+4*1000-1*4+4+100*5-1*5+5+10*6-1*6+6 =7+4000+500+60 =4567

5/6+9又5/6+99又5/6+999又5/6+9999又5/6 =1+10+100+1000+10000-1/6×5 =11111-5/6 =11110又1/6

9又5/7+99又5/7+999又5/7+1/7×6 =10-2/7+100-2/7+1000-2/7+6/7 =(1000+100+10)+(6/7-2/7x3) =1110+0 =1110

(1)9+99+999+9999+99999=(10-1)+(100-1)+(1000-1)+(10000-1)+(100000-1)=10+100+1000+10000+100000-5=111110-5=111105;(2)1-2+3-4+5-6++1991-1992+1993=1+(3-2)+(5-4)+(7-6)++(1991-1990)+(1993-1992)=1+1×996=997;故...

256x19-56x19 =(200+56)x19-56x19 =200x19+56x19-56x19 =3800+(56x19-56x19) =3800+0 =3800 99x35+35 =(99+1)x35 =100x35 =3500 26x39+26 =26x(39+1) =26x40 =1040 56x109-56x9 =56x(109-9) =56x100 =5600 很高兴为你解答,希望能帮到你!

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