Question

5.09×10.7-0.7该怎么简便运算？

Answer 1

5.09×10.7-0.7
＝5.09×10+5.09×0.7-0.7
＝50.9+（5.09-1）×0.7
＝50.9+4.09×0.7
＝50.9+4.09-4.09×0.3
＝54.99-1.227
=53.763

Answer 2

根据题目的简便计算，可以这样计算。
5.09×10.7－0.7
=(5＋0.09)×(10＋0.7)－0.7
=50＋3.5＋0.9＋0.063－0.7
=53.5＋0.263
=53.763

Answer 3

运用乘法分配律计算
5.09×10.7-0.7
=(10+0.7)×5.09-0.7
=10×5.09+5.09×0.7-0.7
=50.9+(5.09-1)×0.7
=50.9+4.09×0.7
=50.9+2.863
=53.763

Answer 4

5.09X10.7-0.7=（5+0.09）X（10+0.7）-0.7=50+0.9+3.5+0.063-0.7=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+0.7×（5.09-1）
=50.9+0.7×4.09
=53.763