решите уравнение и распишите по действиям 1)15x=0,15 2)3,08:y=4 3)3a+8a=1,87 4)7z-3z=5,12

Question 1

Question 2

1) $15x=0,15$

$x=0,15:15$

$x=0,01$

_____________________________________________

$15\cdot0,01=0,15$ (это проверка)

$0,15=0,15$

=============================================

2) $3,08:y=4$

$\frac{3,08}{y}=\frac{4}{1}$

$y=3,08:4$

$y=0,77$

_____________________________________________

$3,08:0,77=4$ (это проверка)

$4=4$

=============================================

3) $3a+8a=1,87$

$11a=1,87$

$a=1,87:11$

$a=0,17$

_____________________________________________

$3\cdot0,17+8\cdot0,17=1,87$ (это проверка)

$0,51+1,36=1,87$

$1,87=1,87$

=============================================

4) $7z-3z=5,12$

$4z=5,12$

$z=5,12:4$

$z=1,28$

_____________________________________________

$7\cdot1,28-3\cdot1,28=5,12$ (это проверка)

$8,96-3,84=5,12$

$5,12=5,12$

Question 3

1)15х=0.15

х=0.15:15

х=0.01

ПРОВЕРКА:15*0.01=0.15, 0.15=0.15.

2)3.08:у=4

у=3.08:4

у=0.77

ПРОВЕРКА:3.08:0.77=4, 4=4.

3)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.

4)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.

Svet1ana_zn · Answer 1 · 2018-01-30T10:34:41+0000

1) $15x=0,15$

$x=0,15:15$

$x=0,01$

_____________________________________________

$15\cdot0,01=0,15$ (это проверка)

$0,15=0,15$

=============================================

2) $3,08:y=4$

$\frac{3,08}{y}=\frac{4}{1}$

$y=3,08:4$

$y=0,77$

_____________________________________________

$3,08:0,77=4$ (это проверка)

$4=4$

=============================================

3) $3a+8a=1,87$

$11a=1,87$

$a=1,87:11$

$a=0,17$

_____________________________________________

$3\cdot0,17+8\cdot0,17=1,87$ (это проверка)

$0,51+1,36=1,87$

$1,87=1,87$

=============================================

4) $7z-3z=5,12$

$4z=5,12$

$z=5,12:4$

$z=1,28$

_____________________________________________

$7\cdot1,28-3\cdot1,28=5,12$ (это проверка)

$8,96-3,84=5,12$

$5,12=5,12$