1.our friends were thought by us all time
2.he will be operated by the doctor in a week
3.the pupil's parents were sent for by the teacher
4.the newspaper was looked for by them everywhere
5.nobody was slept in the bed
6. the telegram was asked for by the neghbor
7. the lecturer was listened to by everybody with great attention
8. the freshman was laughted at by the senior students
9. the headmistress was spoken by the group yesterday
10. their babies were looked after by the young mothers with great care
Пошаговое объяснение: 1. 1) 6800:170=40
2) 60*120=7200
3) 40+7200=7240.
2. 1) 420:30=14
2) 760:190=4
3) 14-4=10
3. 1) 130*4=520
2) 650:50=13
3) 520+13=533
4. 1) 30*180=5400
2) 120*9=1080
3) 5400+1080=6480
5. 1) 40*150=6000
2) 180*3=540
3) 6000-540=5460
6. 1) 90*110=9900
2) 760:40=19
3)9900+19=9919
7. 1) 8*170=1360
2) 6*170=1020
3) 1360-1020=340
4) 340:20=17
8. 1) 50*130=6500
2) 9*140=1260
3) 6500+1260=7760
9. 1) 5*160=800
2) 7500:150=50
3) 800+50=850
10. 1) 17*40=680
2) 18*70=1260
3) 680+1260=1940
4) 1940+60=2000
11. 1) 60*110=6600
2) 1020:170=6
3) 6600-6=6594
12. 1) 40*170=6800
2) 260:20=13
3) 6800+13=6813
4) 6813-6=6807
13. 1) 950:19=50
2) 20*12=240
3) 50+240=290
4) 290+9=299
14. 1) 1020:60=17
2) 1280:8=160
3) 17+160=177
15. 1) 4*180=720
2) 840:7=120
3) 720-120=600
4) 600+30=630
16. 1) 70*140=9800
2) 30*15=450
3) 9800-450=9350
17. 1) 12*80=960
2) 720:40=18
3) 960+18=978
4) 978+20=998
18. 1) 8*140=1120
2) 14400:180=80
3) 1120+80=2000
19. 1) 30*19=570
2) 40*14=560
3) 570-560=10
4) 10+5=15
20. 1) 13*90=1170
2) 20*140=2800
3) 1170+2800=3970
21. 1) 40*110=4400
2) 190*3=570
3) 4400+570=4970
4) 4970+80=5050
22. 1) 6*190=1140
2) 770:110=7
3) 1140-7=1133
23. 1) 19*50=950
2) 11900:170=70
3) 950+70=1020
24. 1) 7800:130=600
2) 170*4=680
3) 600+680=1280
25. 1) 190*9=1710
2) 18*80=1440
3) 1710-1440=270
4) 270+30=300
26. 1) 960:80=12
2) 60*160=9600
3) 12+9600=9612
27. 1) 70*110=7700
2) 9*190=1710
3) 7700-1710=5990
4) 5990+50=6040
28. 1) 30*11=330
2) 6500:50=130
3) 330-130=200
29. 1) 60*180=10800
2) 950:190=5
3) 10800-5=10795
30. 1) 30*18=540
2) 800:16=50
3) 540+50=590
4) 590-40=550
31. 1) 1120:70=16
2) 80*17=1360
3) 16+1360=1376
32. 1) 80*13=1040
2) 160*8=1280
3) 1040+1280=2320
4) 2320-10=2310
33. 1) 20*15=300
2) 70*120=8400
3) 300+8400=8700
4) 8700-40=8660
34. 1) 40*130=5200
2) 80*120=9600
3) 5200+9600=14800
35. 1) 70*19=1330
2) 70*17=1190
3) 1330+1190=2520
4) 2520-20=2500
36. 1) 80*150=12000
2) 16*80=1280
3) 12000-1280=10720
4) 10720+10=10730
37. 1) 13*70=910
2) 130*5=650
3) 910-650=260
4) 260-40=220
38. 1) 1440:18=80
2) 13*90=1170
3) 80+1170=1250
4) 1250-40=1210
39. 1) 11*70=770
2) 170*6=1020
3) 770+1020=1790
4) 1790-40=1750
40. 1) 40*18=720
2) 40*15=600
3) 720-600=120
4) 120:30=4
41. 1) 70*16=1120
2) 520:40=13
3) 1120+13=1133
4) 1133-70=1063
42. 1) 19*30=570
2) 1260:18=70
3) 570+70=640
4) 640-50=590
43. 1) 1170:9=130
2) 600:5=120
3) 130+120=250
4) 250-30=220
44. 1) 20*16=320
2) 16*80=1280
3) 2*10=20
4) 320+1280=1600
5) 1600-20=1580
45. 1) 40*15=600
2) 14*40=560
3) 5*10=50
4) 600+560=1160
5) 1160+50=1210
46. 1) 14*40=560
2) 520:13=40
3) 560-40=520
4) 520+50=570
5) 570-10=560
