Question

3.5×1又四分之一+1.25×2又十分之七+3.8÷五分之四 简便计算

Answer 1

3.5×1又四分之一+1.25×2又十分之七+3.8÷五分之四
=3.5×1.25+1.25×27/10+3.8×1.25
=1.25×(3.5+2.7+3.8)
=1.25×10
=12.5