Question

5.09×10.7-0.7该怎么简便运算？

Answer 1

5.09x10.7-0.7简便运算过程如下：
=5.09x(10+0.7)-0.7
=5.09x10+5.09x0.7-0.7
=50.9+0.7(5.09-1)
=50.9+0.7x4.09
=50.9+2.863
=53.763
本题答案是53.763。

Answer 2

5.09×10.7-0.7

＝（5+0.09）×10.7-0.7

＝5×（10+0.7）+0.09×（10+0.7）-0.7

＝50+3.5+0.9+0.09×0.7-0.7

＝50+3.5+0.9-（1-0.09）×0.7

＝50+3.5+0.9-0.91×0.7

＝53.5+0.9-（0.9+0.01）×0.7

＝53.5+0.9-0.9×0.7-0.007

＝53.5+0.9×0.3-0.007

＝53.5+0.27-0.007

＝53.77-0.007

＝53.763

Answer 3

5.09×10.7-0.7
=5.09×（10+0.7）-0.7
=5.09×10+5.09×0.7-0.7
=50.9+（5.09-1）×0.7
=50.9+4.09×0.7
=50.9+（4+0.09）×0.7
=50.9+4×0.7+0.09×0.7
=50.9+2.8+0.063
=53.763

Answer 4

5.09×10.7-0.7简便运算：
5.09×10.7-0.7
=5.09×(10+0.7)-0.7
=50.9+5.09×0.7-0.7
=50.9+4.09×0.7
=50.9+2.863
=53.763

Answer 5

5.09×10.7-0.7
=5.09×（10+0.7）-0.7
=5.09×10+5.09×0.7-0.7
=50.9+（5.09-1）×0.7
=50.9+4.09×0.7
=50.9+（4+0.09）×0.7
=50.9+4×0.7+0.09×0.7
=50.9+2.8+0.063=53.763