1) 7 1/2÷1/2=15-кусков
2)неполное условие.
3)2÷3/10=20/3=6 2/3=7 (банок)
4)40 1/2÷2/3=81/2÷2/3=243/4=60,75(км/ч)-скорость
<span>2 3/4 :11 +22 1/50 :6 -53.77:19
2 3/4:11=11/4:11=11/4*1/11=1/4
22 1/50:6=1101/50*1/6=1101/300=367/100=3 67/100
53,77:19=5377/100*1/19=283/100*1=2 83/100
1/4+3 67/100=25/100+3 67/100=3 92/100
3 92/100-2 83/100=1 9/100=1,09</span>
Пошаговое объяснение:
1) (-3.8+2 1/3)*(-1 7/8) + 4 1/6 : (-1 2/3)=1,5
-3,8+2 1/3=-3 4/5+2 1/3=-19/5+7/3=
=(-19*3+7*5)/15=-36/15
-36/15*(-1 7/8) =36/15*15/8=4
4 1/6 : (-1 2/3)=25/6:(-5/3)=-25/6*3/5=-5/2=
=-2,5
4-2,5=1,5
2) (2.5-1 5/6): 1 4/9 - 3 5/9 *(-2 1/4)=8 6/13
2.5-1 5/6=2 1/2-1 5/6= 5/2-11/6=(5*3-11)/6=4/6=2/3
2/3:1 4/9=2/3*9/13=6/13
- 3 5/9 *(-2 1/4)=32/9*9/4=8
6/13+8=8 6/13
3) (-5/12 - 3/4) : 2 1/3 + 5 1/3 * 0.75=3,5
-5/12 - 3/4=-5/12 - 9/12=-14/12=-7/6
-7/6:2 1/3=-7/6*3/7=-1/2=-0,5
5 1/3 * 0.75=16/3*3/4=4
-0,5+4=3,5
4)(3/4 - 1 7/8) : 3/4 + 3 1/9 *3/7=-1/6
3/4 - 1 7/8=(6-15)/8=-9/8
-9/8:3/4=-9/8*4/3=-3/2
3 1/9 *3/7=28/9*3/7=4/3
-3/2+4/3=(-9+8)/6=-1/6