Question

简便计算:23.5乘5.66减23.4乘5.67 1.2/(1.2/2.3)/(2.3/3.4)/(3.4/4.5)

Answer 1

23.5×5.66-23.4×5.67

=(23.4+0.1)×5.66-23.4×5.67

=23.4×5.66+0.1×5.66-23.4×5.67

=0.1×5.66-23.4×(5.67-5.66)

=0.566-23.4×0.01

=0.566-0.234

=0.332

1.2/(1.2/2.3)/(2.3/3.4)/(3.4/4.5)

=1.2×(2.3/1.2)×(3.4/2.3)×(4.5/3.4)

=4.5