脱式计算.能简便的要简便运算.2.87×〔6.3-2.3〕54.7-45.3÷152.008×1999+2.00810.8÷〖〔5.28-1.68〕×0.3〗0.53.69÷〔1.23×0.5〕

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！

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

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....

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