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（20+4）x25
=20x25+4x25
=500+100
=600
35x37+65x37
=(35+65)x37
=100x37
=3700
25x41
=25x(40+1)
=25x40+25x1
=1000+25
=1025
32x(200+3)
=32x200+32x3
=6400+96
=6496
38x29+38
=38x(29+1)
=38x30
=1140
39x101
=39x(100+1)
=39x100+39x1
=3900+39
=3939
=20x25+4x25
=500+100
=600
35x37+65x37
=(35+65)x37
=100x37
=3700
25x41
=25x(40+1)
=25x40+25x1
=1000+25
=1025
32x(200+3)
=32x200+32x3
=6400+96
=6496
38x29+38
=38x(29+1)
=38x30
=1140
39x101
=39x(100+1)
=39x100+39x1
=3900+39
=3939
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