А) 18+(9-5)+(10+2) =18+9-5+10+2=39-5=34
б) 16-(12+4)+(15-7) = 16-12-4+15-7=31-23=8
в) 60-(10+40)-(80-30)= 60-10-40-80+30=90-130=-40
г) 11+(27+33)-(51-29)=11+27+33-51+29=100-51=49
- 3/5 - 1/5= - 4/5
- 1/3 - 2/3= - 3/3= -1
- 3/7 - 4/7= - 7/7= - 1
- 1/4 - 5/7= - 7/28 - 20/28= - 27/28
- 5/6 - 1/3= - 5/6 - 2/6= - 7/6= - 1 1/6
- 1/8 - 3/4= - 1/8 - 6/8= - 7/8
-4 3/8 - 2 1/4= -4 3/8 - 2 2/8= - 6 5/8
- 6 1/2 - 3 5/7= - 6 7/14 - 3 10/14= - 9 17/14= - 10 3/14
- 9 - 3 5/9= - 12 5/9
Ответ:
Пошаговое объяснение:
(478-213)-(39-7)=265-32=233
А) 40+Х=560-220
40+х=340
х=340-40
х=300.
б)1000-у=256+154
1000-у=410
у=1410
Х-120=1000-450
х-120=550
х=120+550
х=670
200+у=258+142
200+у=400
у=400-200
у=200