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Сокращаются:
2/12 = 1/6
3/12 = 1/4
4/12 = 1/3
6/12 = 1/2
8/12 = 2/3
9/12 = 3/4
10/12 = 5/6
27930/57
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228 490
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513
513
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0
7.7-(6.3+0.7)=7.7-7=0.7
9.01-(9.01+0.09)=9.01-9.01-0.09=-0.09
100-(54+46)=100-100=0
-272-(-272+862)=-272+272-862=-862
7.7-(6.3-7.7)=7.7-(-1.4)=7.7+1.4=9.1
10-(-9.01-0.09)=10+9.1=19.1
100-(100+54)=100-100-54=-54
-272-(272+28=-272-300=-572
3X - 6 - 5 = 4 - 5X + 1
3X - 11 = 5 - 5X
3X + 5X = 5 + 11
8X = 16
X = 2