№245 163<y<173487<x<499 №2481) 2(11x-5)-17x=55 3) 7 ( 2x+9)+3x=114 2) 5(8x+3)-12=83 4)...

Question

№245
163
487
№248

1) 2(11x-5)-17x=55 3) 7 ( 2x+9)+3x=114
2) 5(8x+3)-12=83 4) 3(4x+13)-25=74

Answer 1

Номер 245
у= 164,165,166,167,168,169,170,171,172.
х=488,489,490,591,492,493,494,495,496,497,498.
номер 248.
1) 2 (11х-5)-17х=55
22х-10-17х=55
5х-10=55
5х=55+10
х=65:5
х=13
2) 5(8х+3)-12=83
40х+15-12=83
40х+3=83
х=(83-80):40
х=2