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How to simplify the operation of 1.8 + 6.4 * 99
1.8+6.4*99
=1.8+6.4*(100-1)
=1.8+640-6.4
=640-4.6
=635.4
How to write the simple calculation of 99 times 38 plus 38
99*38+38
=（99+1）*38
=100*38
three thousand and eight hundred
Minus 99 and 13 / 14 times 7
How much is it??
Minus 99 and 13 / 14 times 7
=(-100+1/14)x7
=-100x7+1/14x7
=-700+1/2
=-699 1 / 2
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