Simple and convenient operation

Simple and convenient operation

Hello!
(37.5% + 2 / 3) * 24
=（3/8+2/3）x24
=3/8x24+2/3x24
=9+16
=25
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(1 / 9 minus 1 / 12) simple calculation by multiplying 4 by 9

(1 of 9 minus 1 of 12) times 4 times 9
=1/9×4×9-1/12×4×9
=4-3
=1

7 out of 16 minus 7 out of 16 × 2 out of 9, how to calculate?
7 out of 16 minus 7 out of 16 × 2 out of 9, how to calculate? You can put it on the paper and calculate again!

=7/16*（1-2/9）=49/144