1.9(x+6)=72 2.23(x-12)=552 3.15(2x+11)=285 4.7(123-4x)=749

Question

1.9(x+6)=72 2.23(x-12)=552 3.15(2x+11)=285 4.7(123-4x)=749

Answer 1

1) 9(х+6)=72
9х+54=72
9х=18
х=18:9
х=2

2) 23(х-12)=552
23х-276=552
23х=828
х=828:23
х=36

3) 15(2х+11)=285
30х+165=285
30х=120
х=120:30
х=4

4) 7(123-4х)=749
861-28х=749
-28х=-112
х=-112:(-28)
х=4

Answer 2

1. 9(х+6)=72
9х+54=72
9х=18
х=18:9
х=2             ответ:2

2. 23(х-12)=552
23х-276=552
23х=828
х=828:23
х=36      ответ:36

3. 15(2х+11)=285
30х+165=285
30х=120
х=120:30
х=4                ответ:4

 4.7(123-4х)=749
861-28х=749
-28х=-112
х=-112:(-28)
х=4             ответ:4