приведите подобные слагаемые
1) -2,5а+1,8а+1,5а;
2) 3,2b-4,3b-3,2b;
3) [tex] \frac{1}{2} c[/tex]+[tex] \frac{1}{3}c [/tex]+[tex] \frac{1}{6} c[/tex]
4) 1,9d-4,2d-3,1d;
5) 7,2a-5a-1,3a;
6) [tex] \frac{1}{3} b[/tex]+[tex] \frac{1}{5} b[/tex]-[tex] \frac{2}{15} b[/tex]
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