数学计算题能简算的要简算,感激涕零!75×0.4+0.68×3/7-1/5×75+4/7×0.680.38×7又3/5+0.038÷0.25+38×0.02

Question

【数学计算题】能简算的要简算,感激涕零!
75×0.4+0.68×3/7-1/5×75+4/7×0.68
0.38×7又3/5+0.038÷0.25+38×0.02

Answer 1

75×0.4+0.68×3/7-1/5×75+4/7×0.68
=75×(0.4-0.2)+0.68×(3/7+4/7)
=15+0.68
=15.68
0.38×7又3/5+0.038÷0.25+38×0.02
=0.38×7.6+0.38××0.4+0.38×2
=0.38×（7.6+0.4+2)
=0.38×10
=3.8