Запишите сумму и разность двух выражений и упровтите её:
1)1,3+m + -4-m;
2)p-m+k+ -p+m+k;
3)3,7-2,6+4,2 + -12,5+2,6-4,2
1)1,3+m + -4-m;
2)p-m+k+ -p+m+k;
3)3,7-2,6+4,2 + -12,5+2,6-4,2
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1,3+m+4-m=1.3+4=5.31.3+m-(4-m)=1.3+m-4+m=2m-2.7
p-m+k+p+m+k=p-m+k-p+m+k=2p+2k
p-m+k-(p+m+k)=p-m+k-p-m-k= -2m
3.7-2.6+4.2+12.5+2.6-4.2=3.7-2.6+4.2+12.5+2.6-4.2=16.2
3.7-2.6+4.2-(12.5+2.6-4.2)=3.7-2.6+4.2-12.5-2.6+4.2= -5.6