640/80*4-4of 20+639-72/9 solve it
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according to the BODMAS rule,
640/80 * 4-4 of 20 + 639 - 72 * 9
=640/80*4-(80)+639-72*9
=640/80*4-80+639-72*9
=8*4-80+639-72*9
=32-80+639-648
=-57
HOPE U UNDERSTAND
640/80 * 4-4 of 20 + 639 - 72 * 9
=640/80*4-(80)+639-72*9
=640/80*4-80+639-72*9
=8*4-80+639-72*9
=32-80+639-648
=-57
HOPE U UNDERSTAND
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