Завдання 310. Виконай одне завдання (на вибір).
1) (825 : 3 + 850 : 5) : 5 825 : 3 + 850 : 5 : 5
2) x – 470 = 660 : 3 600 – 2 • x = 460
1 3 2 4
1) (825 : 3 + 850 : 5) : 5 = 89
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2)
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1 4 2 3
825 : 3 + 850 : 5 : 5 = 309
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2)
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4)
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2) х – 470 = 660 : 3
х – 470 = 220
х = 220 + 470
х = 690
690 – 470 = 660 : 3
220 = 220
600 – 2 • х = 460
2 • х = 600 – 460
2 • х = 140
х = 140 : 2
х = 70
600 – 2 • 70 = 460
460 = 460