381| <u>3
</u> <u>3 </u> 127
8
<u> 6</u>
21
<u> 21 </u>
0
1)
3/4+1/5=15/20+4/20=19/20
19/20×5/15=19/60
2)
12 1/3-7 3/4=12 4/12-7 9/12=
=11 16/12-7 9/12=4 7/12
4 7/12×6/11=55/12×6/11=5/2=
=2 1/2
3)
2 3/5-5/8=2 24/40-25/40=
=1 64/40-25/40=1 39/40
1 39/40÷19 3/4=79/40÷79/4=
=79/40×4/79=1/10
-3b+27+10-5b=37-8b
---------------------------------
<span>3/4x+1 1/6=3 2/9
3/4x = 3 2/9 - 1 1/6
3/4x = 3 4/18 - 1 3/18
3/4x = 2 1/18
3/4x = 37/18
x = 37/18 * 4/3
x = 74/27
x = 2 20/27
и
3 1/15-1 14/15х=1/6
1 14/15x = 3 1/15 - 1/6
29/15x = 3 2/30 - 5/30
29/15x = 2 27/30
29/15x = 87/30
x = 87/30 * 15/29
x = 3/2
x= 1 1/2</span>
1) Вся мука 1 часть
2) 0,3+0,3=0,6(ч) в тесто
3) 1-0,6=0,4(ч) осталась в пакете