1607
×7200
———
0000
0000
3214
11249
———
11570400
74×[55-50)+70*(50-45)+66*(45-40)+62*(40-35)=5*(74+70+66+62)=5×272=1360
1) 4x+5x+4.7=16.4
9х+4.7=16.4
9х=16.4-4.7
9х=11.7
х=11.7:9
х=1.3
<span>(1 1/9*(15:3 3/4-10,5:1 1/2*3/14)+1
1/18)*3/23=(1 1/9*(4-7*3/14)+1 1/18)*3/23=<span>
=(1
1/9*(4-1 1/2)+1 1/18)*3/23=(1
1/9*2 1/2+1 1/18)*3/23=(2 7/9+1 1/18)*3/23=</span></span>
=3 5/6*3/23=1/2
<span>
15:3
3/4=15/1:15/4=15/1*4/15=4/1=4
10,5:1
1/2=10 5/10:1 1/2=10 1/2:1 1/2=21/2:3/2=21/2*2/3=7/1=7
7*3/14=7/1*3/14=3/2=1
1/2
4-1
1/2=4/1-3/2=8/2-3/2=5/2=2 1/2</span>
1 1/9*2 ½=10/9*5/2=25/9=2 7/9
2 7/9+1 1/18=25/9+19/18=50/18+19/18=69/18=3 15/18=
3 5/6
<span>3 5/6*3/23=23/6*3/23=3/6=1/2
</span><span>(5 14\15 -(1 2\9 + 2,6))*(4,2 - 2,76)*2 1\12 =
=(5
14\15 - 3 37/45)*(4,2 - 2,76)*2 1\12 =
</span>
=2 1/9*(4,2 - 2,76)*2 1\12=
=1 2/45*1 11/25*2 1\12=
=3 1/25*2 1\12=6 1/3
<span>
1 2\9
+ 2,6=1 2\9+2 6/10=1 2/9+2 3/5=11/9+13/5=55/45+117/45=172/45=3 37/45</span>
<span>5 14/15-3 37/45=89/15-172/45=267/45-172/45=95/45=
2 5/45=2 1/9
</span>
4,2 - 2,76=1,44=1 44/100=1 11/25
2 1/9*1 11/25=19/9*36/25=19/1*4/25=76/25=3 1/25
<span>3 1/25*2 1\12=76/25*25/12=76/12=6 4/12= 6 1/3
</span>(7\8 - 5\12 )* 1 1\11 - 1\2 +3 1\6 :3 1\3 =
=11/24* 1 1\11 - 1\2 +3 1\6 :3 1\3=
<span>=1/2- 1\2 +3 1\6 :3 1\3=
</span>
=1/2- 1\2 +19/20=
=0+19/20=19/20
7\8 - 5\12=21/24-10/24=11/24
11/24* 1 1\11=11/24*12/11=12/24=1/2
<span>3 1\6 :3 1\3=19/6:10/3=19/6*3/10=19/20
</span><span>1/2-1/2=0
</span>51 2\5 - 22,68 :0,45 +(3\8 +7\20) * 1\29 =
=51 2\5 - 22,68 :0,45 +29/40*1/29=
=51 2\5 -50 2/5+29/40*1/29=
=51 2\5 -50 2/5+1/40=
=1+1/40=1 1/40
3\8 +7\20=15/40+14/40=29/40
22,68 :0,45=50,4=50 4/10=50 2/5
29/40*1/29=1/40
51 2\5 -50 2/5=257/5-252/5=5/5=1
<span>1+1/40=1 1/40</span>
