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canyadegterev
@canyadegterev
October 2021
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Вычислите рационально
1) 2 1/3*3-1 1/2*2 1/3 Ответ: 7/2
2) 1/3-4/5*1/3 Ответ: 1/15
3)2/7*2/3+2/3*3/7+5/7*1/3 Ответ: 5/7
4)2+3 1/7*1 1/3-2 1/7*1 1/3 Ответ: 3 1/3
5)3 3/4*4 1/2:6 3/4 Ответ: 5/2
6)(3/7+3/14-6/35):3/7 Ответ: 1.1
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Aznayr123
1) 2 1/3*3-1 1/2*2 1/3=2 1/3(3-1 1/2)=7/3(6-3)/2=7/3*3/2=(7*3)/(3*2)=7/2 Ответ: 7/2
2) 1/3-4/5*1/3 = 1/3(1-4/5)=1/3*1/5=1/15; Ответ: 1/15
3)2/7*2/3+2/3*3/7+5/7*1/3 =1/3*1/7(4+6+5)=1/3*1/7(15)= 5/7; Ответ: 5/7
4)2+3 1/7*1 1/3-2 1/7*1 1/3= 2+1 1/3(3 1/7-2 1/7)= 2+1 1/3= 3 1/3;
Ответ: 3 1/3
5)3 3/4*4 1/2:6 3/4 = 15/4*(9/2)/(27/4)=(15*9*4)/(4*2*27)=5/2; Ответ: 5/2
6)(3/7+3/14-6/35):3/7=
3/7:3/7+3/14:3/7-6/35:3/7=1+1/2-2/5=3/2-2/5 =(15--4)/10= 11/10=1,1;
Ответ: 1.1
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Answers & Comments
2) 1/3-4/5*1/3 = 1/3(1-4/5)=1/3*1/5=1/15; Ответ: 1/15
3)2/7*2/3+2/3*3/7+5/7*1/3 =1/3*1/7(4+6+5)=1/3*1/7(15)= 5/7; Ответ: 5/7
4)2+3 1/7*1 1/3-2 1/7*1 1/3= 2+1 1/3(3 1/7-2 1/7)= 2+1 1/3= 3 1/3;
Ответ: 3 1/3
5)3 3/4*4 1/2:6 3/4 = 15/4*(9/2)/(27/4)=(15*9*4)/(4*2*27)=5/2; Ответ: 5/2
6)(3/7+3/14-6/35):3/7= 3/7:3/7+3/14:3/7-6/35:3/7=1+1/2-2/5=3/2-2/5 =(15--4)/10= 11/10=1,1; Ответ: 1.1