Сторінка 72 вправа 2. Розв’яжи рівняння.
(а + 5889) : 28 = 2660
(13 764 – b) • 404 = 92 112
6400 + 2600 – 3 • х = 1200
7290 : y + 12 860 = 12 941
(а + 5889) : 28 = 2660
а + 5889 = 2660 • 28
а + 5889 = 74480
а = 74480 – 5889
а = 68591
(68591 + 5889) : 28 = 2660
2660 = 2660
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6400 + 2600 – 3 • х = 1200
3 • х = 9000 – 1200
3 • х = 7800
х = 7800 : 3
х = 2600
6400 + 2600 – 3 • 2600 = 1200
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(13764 – b) • 404 = 92112
13764 – b = 92112 : 404
13764 – b = 228
b = 13764 – 228
b = 13536
(13764 – 13536) • 404 = 92112
92112 = 92112
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7290 : у + 12860 = 12941
7290 : у = 12941 – 12860
7290 : у = 81
у = 7290 : 81
у = 90
7290 : 90 + 12860 = 12941
12941 = 12941
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