1. у = 100
2. х = 141
3. b = 458
4. x = 30
Объяснение:
1. 8у – 345 = 455
8у = 455 + 345
8у = 800
у = 100
2. 630 : (150–х) = 70
630/150–х = 70
630 = 70•(150–х)
9 = 150–х
х= 150–9
х = 141
3. 35+(b+165)=658
35+b+165=658
200+b=658
b=658–200
b=458
4. 400.(x–5)=10 000
400x–2 000=10 000
400x=10 000+2 000
400x=12 000
x = 30
Объяснение:
8y-345=455
8y=455+345
8y=800
y=800:8
y=100
8×100-345=455
455=455
630:(150-x)=70
150:×=630:70
150:×=90
x=150-90
x=60
630:(150-x)=70
70=70
35+(b+165)=685
b+165=685-35
b+165=650
b=650-165
b=485
35+(485+165)=685
685=685