1.вычисли
690:30x7-161
450:(315-265):9
(644-92x7):40
20х(672-84х8)
21-420х20+784
(67х5-334)х507
690:30x7-161
450:(315-265):9
(644-92x7):40
20х(672-84х8)
21-420х20+784
(67х5-334)х507
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Answers & Comments
690:30x7-161=0
1)690:30=23
2)23×7=161
3)161-161=0
450:(315-265):9=1
1)315-265=50
2)450:50=9
3)9:9=1
(644-92x7):40=0
1)92×7=644
2)644-644=0
3)0:40=0
20х(672-84х8)=0
1)84×8=672
2)672-672=0
3)20×0=0
21-420х20+784=-7595
1)420×20=8400
2)21-8400=-8379
3)-8379+784=-7595
(67х5-334)х507=507
1)67×5=335
2)335-334=1
3)1×507=507