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b)0,25:1 1/4* (1 3/8+ 1 1/3)=1/4:1 1/4*(1 3/8+1 1/3)=1/4: 5/4 *(11/8+4/3)=1/4*4/5*(33/24+32/24)=1/5*65/24=13/24
c)(4 7/12 - 2 5/36):3 2/3 + 3 2/7*2 1/3=(4 7/12-2 5/36):3 2/3+3 2/7*2 1/3=(55/12-77/36):11/3+23/7*7/3=(165/36-77/36):11/3+23/3=88/36*3/11+23/3=8/12+23/3=8/12+92/12=100/12=25/3=3 1/3
Pozdrawiam ; )