简便计算1.0.386×15+6.14×1.52.12.5×3.2×0.0473.（0.45×6.38+0.45×3.62）÷0.54.54.7-45.3÷155.2008×1999+20086.10.8÷[（5.28-1.68）×0.3]7.35.2×45.6+45.6×63.2+45.6

Question

简便计算
1.0.386×15+6.14×1.5
2.12.5×3.2×0.047
3.（0.45×6.38+0.45×3.62）÷0.5
4.54.7-45.3÷15
5.2008×1999+2008
6.10.8÷[（5.28-1.68）×0.3]
7.35.2×45.6+45.6×63.2+45.6

Answer 1

41.0.386×15+6.14×1.5
=0.386×15+0.614×15
=15×（0.386+0.614）
=15×1
=15
2.12.5×3.2×0.047
=12.5×8×0.4×0.047
=100×0.4×（0.05-0.003）
=40×0.05-40×0.003
=2-0.12
=1.88
3.（0.45×6.38+0.45×3.62）÷0.5
=[0.45×(6.38+3.62)]÷0.5
=（0.45×10）÷0.5
=4.5÷0.5
=9
4.54.7-45.3÷15
=54.7-(45÷15+0.3÷15)
=54.7-（3+0.02）
=51.68
5.2008×1999+2008
=2008×（1999+1）
=2008×2000
=4016000
6.10.8÷[（5.28-1.68）×0.3]
=10.8÷（3.6×0.3）
=10.8÷1.08
=10
7.35.2×45.6+45.6×63.2+45.6
=45.6×（35.2+63.2+1）
=45.6×（100-0.4）
=4560-18.24
=4541.76
第7题有一个应该是35.8或者63.8
=45.6×（35.2+63.8+1）
=45.6×100
4560
或者
=45.6×（35.8+63.2+1）
=45.6×100
=4560