1)=(13-9)×(13+9)=4(13+9)=4×22=88
3)=(11/5)-2,8²=121/25-(14/5)²=121/25-196/25 = -3
2)=(20-19)×(20+19)=1(20+19)=1×39=39
4)=(7/2)²-(37/10)²=49/4-((37/10)²=49/4-1369/100=-36/25
6)=49/81-(1/6)²=49/81-1/36=187/324
8)=9/100-(⅘)²=9/100-16/25=-11/20
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Answers & Comments
1)=(13-9)×(13+9)=4(13+9)=4×22=88
3)=(11/5)-2,8²=121/25-(14/5)²=121/25-196/25 = -3
2)=(20-19)×(20+19)=1(20+19)=1×39=39
4)=(7/2)²-(37/10)²=49/4-((37/10)²=49/4-1369/100=-36/25
6)=49/81-(1/6)²=49/81-1/36=187/324
8)=9/100-(⅘)²=9/100-16/25=-11/20