9.9x9.9+0.99简便运算

蒋孟祝17699.9*9.9+0.99简算 -
倪巩宏13323977058 ______ (9.9*9.9+9.9)/0.99=9.9*9.9/0.99+9.9/0.99=9.9*10+10=99+10=109

蒋孟祝17699.9乘9.9加0.99 -
倪巩宏13323977058 ______ 9.9x9.9+0.99 =(10-0.1)x(10-0.1)+0.99 =10x10-10x0.1-0.1x10+0.1x0.1+0.99 =100-1-1+0.01+0.99 =100-2+1 =99

蒋孟祝17699.9*9.9+0.99简便计算 -
倪巩宏13323977058 ______ =9.9x9.9+9.9x0.1=9.9x(9.9+0.1)=99

蒋孟祝17699.9x9.9+0.99 -
倪巩宏13323977058 ______ 9.9x9.9+0.99=9.9x9.9+9.9*0.1=9.9x(9.9+0.1)=9.9*10=99

蒋孟祝17690.99+9.9x9.9简便计算 -
倪巩宏13323977058 ______[答案] =0.1x9.9+9.9x9.9 =9.9x(0.1+9.9) =9.9x10 =99

蒋孟祝17692.9乘9.9加0.99简算 -
倪巩宏13323977058 ______[答案] 2.9x9.9+0.99 =9.9x2.9+9.9x0.1 =9.9x(2.9+0.1) =9.9x3 =(10-0.1)x3 =30-0.3 =29.7

蒋孟祝17690.9X9.9+0.99简便运算0.9*9.9+0.99简便运算 -
倪巩宏13323977058 ______[答案] 0.9*9.9+0.99 =0.9*9.9+0.9*1.1 =0.9*(9.9+1.1) =0.9*[(10-0.1)+(1+0.1)] =0.9*11 =0.9*(10+1) =9.9

蒋孟祝17699.9x9.9X0.99 -
倪巩宏13323977058 ______ 简便计算 9.9x9.9+0.99 =99x0.99+0.99 =(99+1)*0.99 =100*0.99 =99

蒋孟祝17692.9乘9.9加0.99简算 -
倪巩宏13323977058 ______ 2.9x9.9+0.99 =9.9x2.9+9.9x0.1 =9.9x(2.9+0.1) =9.9x3 =(10-0.1)x3 =30-0.3 =29.7

蒋孟祝1769奥数好的快来!十万火急!!!!!!!!!!!!!!!!!!!!! -
倪巩宏13323977058 ______ 1.解: 0.5÷(0.5*0.5)*(0.5+0.5)=2 2.解:⑴. 9.9*9.9+0.99=(99/10)*(99/10)+(99/100) =[(99*99)/100]+(99/100) =(99*99+99)/100 =[99*(99+1)]/100 =(99*100)/100 =99 ⑵. 5795.5795÷5.795*579.5=5795.5795/(5.795*579.5) =57955795/(5795*5795) ...