18: The ratio of 3.6 to the simplest integer is______ The ratio is______ ．

18: The ratio of 3.6 to the simplest integer is______ The ratio is______ ．

(1) 18:3.6, = (18 × 5): (3.6 × 5), = 90:18, = (90 ﹣ 18): (18 ﹣ 18), = 5:1; (2) 18:3.6, = 5:1, = 5 ﹣ 1, = 5

Minus four times minus six and nine eight plus minus eight times minus eight and nine eight minus twelve times eight and nine eight
Simple algorithm,

-4 * (- 6 and 8 / 9) + [- 8 * (- 8 and 8 / 9)] - 12 * 8 and 8 / 9
solution
=4 * 6 and 8 / 9 + 8 * 8 and 8 / 9-12 * 8 and 8 / 9
=4 * 6 and 8 / 9 + (8-12) * 8 and 8 / 9
=4 * 6 and 8 / 9-4 * 8 and 8 / 9
=4 * (6 and 8 / 9-8 and 8 / 9)
=4*(-2)
=-8

What is 8 × two fifths plus 4 × two ninths plus 8 × three fifths

73 out of 9

9 / 4 times (minus 6 / 7) - 3.75 △ 9-7 / 6)

9 / 4 times (minus 6 / 7) - 3.75 ÷ (- 7 / 6)
=-2.25 times 6 / 7 + 3.75 × 6 / 7
=（-2.25+3.75）×6/7
=-1.5×6/7
=-9/7
=-1 and 2 / 7