Решите уравнения 3а+8=1.87 7z-3z=5.12 2t+5t+3.18=25.3

Question

Решите уравнения
3а+8=1.87
7z-3z=5.12
2t+5t+3.18=25.3

Answer 1

1) 3a = 1.87 - 8
3a = -6.13
a = 2.04(3)
2) 4z=5.12
z = 1.28
3) 7t=25.3-3.18
7t=22.12
t=3.16

Comments

1)3а+8а=1.87 11а=1.87 а=1.87:11 а=0.17 ПРОВЕРКА:3*0.17+8*0.17=1.87, 0.51+1.36=1.87, 1.87=1.87. 2)7z-3z=5.12 4z=5.12 z=5.12:4 z=1.28 ПРОВЕРКА: 7*1.28-3*1.28=5.12,8.96-3.84=5.12, 5.12=5.12. 3)2t+5t+3.18=25.3 7t=25.3-3.18 7t=22.12 t=22.12:7 t=3.16 ПРОВЕРКА: 2*3.16+5*3.16+3.18=25.3, 6.32+15.8+3.18=25.3, 25.3=25.3.

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в 1 задаче, ВЫ, "8а" не написали, там просто "8"