Question

数学应用题你会吗？

计算（用简便方法的要用简便方法)。
2.48-1.27+3.1 7.41-2.96-2.04
= =
5.32+8.37-9.78 178-56.99-73.01
= =

Answer 1

2.48-1.27+3.1
=(2-1+3)+(0.48-0.27+0.1)
=4+0.31
=4.31
7.41-2.96-2.04
= 7.41-(2.96+2.04)
=7.41-5
=2.41
5.32+8.37-9.78
=-[9.78-(5.32+8.37）]
=-[9.78-13.69]
=3.91
178-56.99-73.01
= 178-(56.99+73.01)
=178-130
=48

Answer 2

不过是错下位了在加减啊！！

Answer 3

7.41-2.96-2.04
= 7.41-(2.96+2.04)
=7.41-5
=2.41
178-56.99-73.01
= 178-(56.99+73.01)
=178-130
=48

Answer 4

第一题么有简便方法吧，就得4.31，
第二题先把2.96+2.04算出来等于5，答案是2.41
第三题貌似也没吧，答案3.91
第四题和第二题一样，答案是48
爷第一次遇见这么白痴的题。。。