а)
- 20 *(х-13)= -220
х-13= -220:(-20)
х-13=11
х=11+13=24
проверка
-20*(24-13)= -220
-220 = -220
б)
(30-7х)*8=352
30-7х= 352:8
30-7х=44
7х=30 - 44
7х= -14
х= -2
(30-7*(-2))*8=352
(30-(-14))*8=352
44*8=352
352=352
в)
5\12у-3\4=1\2
5\12у = 1\2 + 3\4 = 2+3 \4 = 5\4
у = 5\4 : 5\12 = 5\4 * 12\5 = 3
5\12*3-3\4=1\2
15\12 -3\4=1\2
15-9 \12 =1\2
6\12=1\2
1\2 =1\2
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Answers & Comments
а)
- 20 *(х-13)= -220
х-13= -220:(-20)
х-13=11
х=11+13=24
проверка
-20*(24-13)= -220
-220 = -220
б)
(30-7х)*8=352
30-7х= 352:8
30-7х=44
7х=30 - 44
7х= -14
х= -2
проверка
(30-7*(-2))*8=352
(30-(-14))*8=352
44*8=352
352=352
в)
5\12у-3\4=1\2
5\12у = 1\2 + 3\4 = 2+3 \4 = 5\4
у = 5\4 : 5\12 = 5\4 * 12\5 = 3
проверка
5\12*3-3\4=1\2
15\12 -3\4=1\2
15-9 \12 =1\2
6\12=1\2
1\2 =1\2