2024年4月18日发(作者：青岛初一数学试卷推荐)

8x(25x15)

=(4x2)x(25x15)

=(4x25)x(2x15)

=100x30

=3000

5x4x5x20

=5x5x4x20

=25x4x20

=100x20

=2000

420÷18

=420÷6÷3

=70÷3

=70/3

25x7x4x3

=(25x4)x(7x3)

=100x21

=2100

15x32x25

=15x(4x8)x25

=(15x8)x(25x4)

=120x100

=12000

3800÷25÷4

=3800÷(25x4)

=3800÷100


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