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лили159
@лили159
August 2022
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вычислить 2.1*1.9. 4.02*3.98. 19.8*20.2.
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sedinalana
Verified answer
2,1*1,9=(2+0,1)(2-0,1)=4-0,01=3,99
4,02*3,98=(4+0,02)(4-0,02)=16-0,0004=3,9996
19,8*20,2=(20-0,2)(20+0,2)=400-0,04=399,96
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Verified answer
2,1*1,9=(2+0,1)(2-0,1)=4-0,01=3,994,02*3,98=(4+0,02)(4-0,02)=16-0,0004=3,9996
19,8*20,2=(20-0,2)(20+0,2)=400-0,04=399,96