Second, this formula can't use the law of multiplication and distribution, and the calculation is wrong.

Correction: 4×( 1 1×25)

=4× 1 1×25

=4×25× 1 1

= 100× 1 1

= 1 100

Third,

1、 259+77+34 1+223

=259+34 1+77+223

=(259+34 1)+(77+223)

=600+300

=900 (unit)

2、640÷(24÷6)

=640÷4

= 160 (hours)

3、 (64-27)×86-27×86

=37×86-27×86

=86×(37-27)

=86× 10

=860 (yuan)

4、 25×20×7

=500×7

=3500 (package)