Question

6.2乘9.9的简便计算

Answer 1

6.2乘9.9的简便计算

6.2乘9.9
=6.2×9.9
=6.2×(10-0.1)
=6.2×10-6.2×0.1
=62-0.62
=61.38

9.89乘9.9的简便计算

9.89乘9.9
=9.89x(10-0.1)
=9.89x10-9.89x0.1
=98.9-0.989
=97.911

0.97乘于9.9的简便计算

0.97乘以9.9
＝0.97×（10-0.1）
=0.97×10-0.97×0.1
=9.7-0.097
=9.603

56.5乘9.9加56.5的简便计算

你这道题的题目应该是：“56.5×9.9＋5.65”这样才可以简算。不然的话，直接计算还要简便些。
56.5×9.9＋5.65…………把5.65改写成56.5×0.1的形式
=56.5×9.9＋56.5×0.1
=56.5×（9.9＋0.1）
=56.5×10
=565

不然的话只能是这样计算：
59.5（9.9+1）
=59.5×10.9
=648.55

21乘0.62减6.2的简便计算

21x0.62-6.2
=21x0.62-10x0.62
=（21-10）x0.62
=11x0.62
=（10+1）x0.62
=6.2+0.62
=6.82

6.2乘以10.1的简便计算

6.2×10.1
=6.2×(10+0.1)
=6.2×10+6.2×0.1
=62+0.62
=62.62

9.9×10.1的简便计算

9.9×10.1的简便计算
=9.9x（10+0.1）
=9.9x10+9.9x0.1
=99+0.99
=99.99

4.7加3.8乘以6.2减1.9简便计算

4.7+3.8×6.2-1.9
=4.7+1.9（6.2×2-1）
=4.7+11.4（2-0.1）
=22.8+4.7-1.14
=26.36

9.9×54+9.9×45+9.9简便计算

9.9×54+9.9×45+9.9
=9.9×(54+45+1)
=9.9×100
=990

简便计算0.27乖9.9

0.27乖9.9
=0.27x(10-0.1)
=0.27x10-0.27x0.1
=2.7-0.027
=2.673
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