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a =0,3
b = 2,5
c=0,004
0,002b -1c +0,7a
0,002 *2,5 - 0,004 +0,7*0,3=0,005-0,004+0,21=0,211
= -0,21+ 0,002+0,005-0,024+0,42=0,193
0,7*0,3+0,002*2,5-0,004=0,21+0,005-0,004=0,211