Ответ:
1) (3,1+2,09)*6= 31.14
2) (4-1,9)*30=63
3) (6,5-4,9)*20= 32
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Ответ:
1) (3,1+2,09)*6= 31.14
2) (4-1,9)*30=63
3) (6,5-4,9)*20= 32
2) 2,1•30=63
3) 1,6•20=32