А) 1/2 = 6/12 (шесть 12-тых долей)
12 : 2 = 6 - доп.множ. к 1/2 = (1*6)/(2*6) = 6/12
2/3 = 8/12 (восемь 12-тых долей)
12 : 3 = 4 - доп.множ. к 2/3 = (2*4)/(3*4) = 8/12
5/6 = 10/12 (десять 12-тых долей)
12 : 6 = 2 - доп.множ. к 5/6 = (5*2)/(6*2) = 10/12
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b) 1/2 = 9/18 (девять 18-тых долей)
18 : 2 = 9 - доп.множ. к 1/2 = (1*9)/(2*9) = 9/18
2/3 = 12/18 (двенадцать 18-тых долей)
18 : 3 = 6 - доп.множ. к 2/3 = (2*6)/(3*6) = 12/18
5/6 = 15/18 (пятнадцать 18-тых долей)
18 : 6 = 3 - доп.множ. к 5/6 = (5*3)/(6*3) = 15/18
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с) 1/2 = 18/36 (восемнадцать 36-тых долей)
36 : 2 = 18 - доп.множ. к 1/2 = (1*18)/(2*18) = 18/36
2/3 = 24/36 (двадцать четыре 36-тых долей)
36 : 3 = 12 - доп.множ. к 2/3 = (2*12)/(3*12) = 24/36
5/6 = 30/36 (тридцать 36-тых долей)
36 : 6 = 6 - доп.множ. к 5/6 = (5*6)/(6*6) = 30/36
А)3 1/2+1/2 = 7/2 +1/2 = 8/2 = 4
б)4 1/3+ 1 2/3 = 13/3 +5/3 = 18/3 = 6
<span>в)2 3/8+3 5/8 = 19/8 +29/8 = 48/8 = 6
</span>г)3 2/3+1 2/3 = 11/3 +5/3 = 16/3 = 5ц 1/3
д) 5/7+5 4/7 = 5/7 +39/7 = 44/7 = 6 ц 2/7
<span> е)5 2/9+2 1/9 = 47/9 +19/9 = 66/9 = 22/3 = 7ц 1/3
</span>
а) 3/8+2 1/4 = 3/8 + 9/4 = 3/8 + 18/8 = 21/8 = 2ц 5/8
б)1/4+3 1/6 = 1/4 + 19/6 = 3/12 +38/12 = 41/12 = 3ц 5/12
в)5 2/15+3 2/9 = 77/15 + 29/9 = 231/45 +145/45 = 376/45 = 8ц 16/45
г)2 4/9+1/6 = 22/9 +1/6 = 44/18 +3/18 = 47/18 = 2ц 11/18
д)1 3/5+10 1/4 = 8/5 +41/4 = 32/20 +205/20 = 237/20 = 11ц 17/20
<span> е)4 1/4+2/9 =</span> 17/4 +2/9 = 153/36 +8/36 = 161/36 = 4ц 17/36 <span>
</span>
4/5......................
140=100%
Х=30%
140:100=1,4
1,4×30=42
140-42=98
