Решите пожалуйста по действиям дам 20 баллов
1)(4 1/6×3):(7×5/21)-1 3/4 × 4
2)(3 4/9-1 11/12)× 3 9/11 + 6:12/25-2 1/3
1)(4 1/6×3):(7×5/21)-1 3/4 × 4
2)(3 4/9-1 11/12)× 3 9/11 + 6:12/25-2 1/3
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Answers & Comments
1) 4 1/6*3=25/6*3=25/2
7*5/21=5/3
25/2:5/3=25/2*3/5=15/2=7 1/2
1 3/4*4=7/4*4=7
7 1/2-7=1/2
2) 3 4/9-1 11/12=2 13/9-1 11/12=2 52/36-1 33/36=1 19/36
1 19/36*3 9/11=55/36*42/11=35/6=5 5/6
6:12/25=6*25/12=25/2=12 1/2
5 5/6+12 1/2-2 1/3=5 5/6+12 3/6-2 2/6=15 6/6=16