0,9(-8-3x)=0,9(-8-12)=0,9*(-20)=-18
9дм2=900см2
<span>90см2<9дм2</span>
№ 546:
1) -6,9;
2) 6,9;
3) 13,8;
4) - 13,8;
5) 69;
<span>6) -414;
№ 548;
1) больше 0;
2) = 0;
3) меньше 0;
4) больше 0.
</span>
17 ÷ <span>(4 1/3 - 3 1/5) = 15
1)</span>4 1/3 - 3 1/5 = 13/3 - 16/5 =(13 × 5 - 16 × 3)/15 = 65/15 - 48/15 = 17/15 = 1 2/15
2)17 ÷ 1 2/15 = 17 ÷ 17/15 = 17 × 15/17 = 15
(15 - 4 1/8) ×<span> (3 14/15 - 2 3/5) =14 1/2
1)</span>15 - 4 1/8 = 15/1 - 33/8 =(15 × 8 - 33 × 1)/8 = 120/8 - 33/8 = 87/8 = 10 7/8
2)3 14/15 - 2 3/5 = 59/15 - 13/5 = (59 × 1 - 13 × 3)/15 = 59/15 - 39/15 = 20/15 = 4/3 = 1 1/3
3)10 7/8 × 1 1/3 = 87/8 × 4/3 = 29/2 = 14 1/2