Question

5X1.03X0.2、32X1.25、0.45X99、53X10.1、4.2X6.51+3.49X4.2、9.99X1.

Answer 1

5X1.03X0.2

=(5x0.2)x1.03

=1x1.03

=1.03

32X1.25

=4x(8x1.25)

=4x10

=40

0.45X99

=0.45x(100-1)

=0.45x100-0.45

=45-0.45

=44.55

53X10.1

=53x(10+0.1)

=53x10+53x0.1

=530+5.3

=535.3

4.2X6.51+3.49X4.2

=4.2x(6.51+3.49)

=4.2x10

=42

9.99X1.53+3.33X3.41

=3.33x4.59+3.33x3.41

=3.33x(4.59+3.41)

=3.33x8

=26.64