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9.9×4.5简便计算

9.9×4.5+0.45 =(9.9+0.1)×4.5 =10×4.5 =45 你好,本题已解答,如果满意 请点右下角“采纳答案”。

9.9x4.5+0.45 =9.9×4.5+4.5×0.1 =4.5×(9.9+0.1) =4.5×10 =45

=4.5×(10-0.1) =4.5×10 - 4.5×0.1 =45 - 0.45 =44.55

45*(10-0.1)=450-4.5=445.5

先把4.5化成分数9/2,然后9/2*9=1/2,再把1.2化成6/5,然后6/5*1/2=3/5=0.6 小数,分数(真分数,假分数)的互化

原式 =1.27+3.9+9.33+4.5 =(1.27+9.33)+3.9+(4.4+0.1) =(10.6+4.4)+(3.9+0.1) =15+4 =19 供参考。

相当于4.5*(10-0.1) =4.5*10-4.5*0.1 =45-0.45 =44.55

10-0.1

6.96×9.9=6.96×(10-0.1)=6.96×10-6.96×0.1=69.6-0.696=68.904 8×4.6=8×(5-0.4)=8×5-8×0.4=40-3.2=36.8

5.4×4.5+5.5×5.4=5.4×(4.5+5.5); 2.5×1.9-2.5×0.9=2.5×(1.9-0.9); 7.5×9.9+0.75=7.5×9.9+7.5×0.1=7.5×(9.9+0.1).故答案为:5.5,0.9,0.75.

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