№145
Упростите:
1)205x-(55x+39x)
2)617x+(33x+47x)
3)717n+8n+283n+42n
4)26y+(32y-7y)+y
№146
Упростите выражение:
1)25a+21+7a+52
2)38y+23y+15+4y+9
3)43x+95+3x+6
4)321b+23b+189b+27
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