80т 103 кг думаю так сойдет?
1)4+2=6
2)7:7=1
3)0*6=0
4)1-0=1
5 + 4 = 9
9 - 8 = 1
6 - 3 = 3
3 + 7 = 10
<span>а)-13b-8+(b+8)=-13b-8+b+8=-12b
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<span>б)(12b-8)-(9b-9) = 12b-8-9b+9=3b+1
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<span>в)9b+8(b-6)=9b+8b-48=17b-48
</span><span>г)6b-21(b+3)=6b-21b-63=-15b-63</span>