упростите до конца
4/9 *(2.7m-2.1/4n)-4.2(5/7m-0.5n)=1.2m-1n-3m+2.1n=........
= -1.8m+1.1n ...................... .
1.2-1n-3v+2.1=1,8m+1.1n
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= -1.8m+1.1n ...................... .
1.2-1n-3v+2.1=1,8m+1.1n