Question

脱式计算。能简便的要简便运算。

2.87×〔6.3-2.3〕
54.7-45.3÷15
2.008×1999+2.008
10.8÷〖〔5.28-1.68〕×0.3〗0.5
3.69÷〔1.23×0.5〕

Answer 1

2.87×〔6.3-2.3〕
=2.87×4.0
=11.48

54.7-45.3÷15
=54.7-3.02
=51.68

2.008×1999+2.008
=4013.992+2.008
=4016

10.8÷〖〔5.28-1.68〕×0.3〗0.5
=10.8÷（3.6×0.3）×0.5
=10.8÷1.08×0.5
=10×0.5
=5

3.69÷〔1.23×0.5〕
=3.69÷0.615
=6

。。。也许我误解lz的意思了....

Answer 2

2.87×〔6.3-2.3〕
=2.87×4.0
=11.48

54.7-45.3÷15
=54.7-3.02
=51.68

2.008×1999+2.008
=2.008×(1999+1)
=2.008×2000
=4016

10.8÷〖〔5.28-1.68〕×0.3〗0.5
=10.8÷（3.6×0.3）×0.5
=10.8÷1.08×0.5
=10×0.5
=5

3.69÷〔1.23×0.5〕
=3.69÷1.23÷0.5
=3÷0.5
=6
应该是这样，希望我的答案对你有帮助！

Answer 3

2.87×〔6.3-2.3〕
=(3-0.13)×4
=12-0.13×4
=12-0.52
=11.48

54.7-45.3÷15
=54.7-(45+0.3)\15
=54.7-45\15-0.3\15
=54.7-3-0.02
=51.68

2.008×1999+2.008
=2.008*(1999+1)
=2.008*2000
=4016

10.8÷〖〔5.28-1.68〕×0.3〗0.5
=10.8*0.3*0.5\[(5+0.28)-(2-0.32)]
=10.8\（3.6*0.3）*0.5
=10.8\1.08*0.5
=10*0.5
=5

3.69÷〔1.23×0.5〕
=3*1.23\(1.23*0.5)
=3\0.5
=6

Answer 4

2.87×〔6.3-2.3〕
=2.87×4.0
=11.48

54.7-45.3÷15
=54.7-3.02
=51.68

2.008×1999+2.008
=2.008×(1999+1)
=2.008×2000
=4016

10.8÷〖〔5.28-1.68〕×0.3〗0.5
=10.8÷（3.6×0.3）×0.5
=10.8÷1.08×0.5
=10×0.5
=5

3.69÷〔1.23×0.5〕
=3.69÷1.23÷0.5
=3÷0.5
=6
仅供参考