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кек642
@кек642
July 2022
1
2
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вычислите (3/7-1 1/3)*21/86 :7 2/5
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Answers & Comments
MiNiKoTiC1984
(3/7-1 1/3)*21/86 :7 2/5=
1)
3/7-1 1/3=3/7-4\3=
37
−
43
=
3 · 33 · 7
−
7 · 47 · 3
=
921
−
2821
=
9 − 2821
=−
19\21
2)19\21*21\86=19\86
3)19\86:7 2\5=19\86:37:5=
1986
÷
375
=
1986
·
537
=
19 · 586 · 37
=
95\3182
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Answers & Comments
1)3/7-1 1/3=3/7-4\3=37−43=3 · 33 · 7−7 · 47 · 3=921−2821=9 − 2821=−19\21
2)19\21*21\86=19\86
3)19\86:7 2\5=19\86:37:5=1986÷375=1986·537=19 · 586 · 37=95\3182