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99×99的递等式巧算

99×99 =99×(100-1) =99×100-99x1 =9900-99 =9801

199X99+99X2 =99X(199+2) =99X200+99X1 =19800+99 =19899

99×125 =(100-1)x125 =100x125-1x125 =12500-125 =12375

详细步骤写在纸上了

99×17 =(100-1)×17 =100×17-1×17 =1700-17 =1683

=778(99+1) =778×100 =77800

(1)99×38=(100-1)×38=100×38-1×38=3800-38=3762;(2)125×56=125×8×7=1000×7=7000;(3)5500÷125 =5500÷(5×5×5)=5500÷5÷5÷5=1100÷5÷5=220÷5=44;(4)345+655×240=345+157200=157545;(5)478-156-144=478-(156+144)=478-300=178;(...

五年级递等式计算,能巧算的要巧算: 9.9x90 +99 =9.9×90+9.9×10 =9.9×(90+100 =9.9×100 =990

解:将67=69-2,如下: 69X99+67 =69X99+69-2 =69X(99+1)-2 =69X100-2 =6900-2 =6898 满意请采纳。

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