А) - х=1/4-19/20 -х=5/20-19/20 -х=-14/20=-7/10 Х=7/10 Б)(3/4+у):2=5/6+2 1/3 (3/4+у):2=5/6+2 2/6 (3/4+у):2=3 1/6 3/4+у=3 1/6*2=19/6*2 3/4+у=19/3 У=19/3-3/4=76/12-9/12 У=67/12=5 7/12 2) 1 2/5+1 1/2=1 4/10+1 5/10=2 9/10 2 9/10*15/29=29/10*15/29=3/2 3/2:2 1/4=3/2*4/9=2/3 1 5/12-2/3=1 5/12-8/12=1-3/12=9/12=3/4
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А) - х=1/4-19/20 -х=5/20-19/20 -х=-14/20=-7/10 Х=7/10 Б)(3/4+у):2=5/6+2 1/3 (3/4+у):2=5/6+2 2/6 (3/4+у):2=3 1/6 3/4+у=3 1/6*2=19/6*2 3/4+у=19/3 У=19/3-3/4=76/12-9/12 У=67/12=5 7/12 2) 1 2/5+1 1/2=1 4/10+1 5/10=2 9/10 2 9/10*15/29=29/10*15/29=3/2 3/2:2 1/4=3/2*4/9=2/3 1 5/12-2/3=1 5/12-8/12=1-3/12=9/12=3/4