Răspuns:
Explicație pas cu pas:
a)
1/48 + 5/64 + 1/96 = 2/96 + 1/96 + 5/64 = 3/96 + 5/64 = 1/32 + 5/64
= 2/64 + 5/64 = 7/64
1 - 1/8 = 8/8 - 1/8 = 7/8
7/64 : 7/8 = 7/64 * 8/7 = 1/8
1 + 1/8 = 8/8 + 1/8 = 9/8
72*9/8 = 9*9 = 81
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b)
1/7 + 1/2 : 7/2 = 1/7 + 1/2 *2/7 = 1/7 + 1/7 = 2/7
1 : 2/7 = 1*7/2 = 7/2
1/3 + 7/2 = 2/6 + 21/6 = 23/6
12/23 *23/6 = 2
1/3 + 2 = 1/3 + 6/3 = 7/3
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c)
1 + 3/4 = 4/4 + 3/4 = 7/4
5/2 - 7/4 = 10/4 - 7/4 = 3/4
3/4 : 7/8 = 3/4*8/7 = 6/7
1/4 + 6/7 = 7/28 + 24/28 = 31/28
31/28 : 1/14 = 31/28*14 = 31/2
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e)
1/3 : 3 = 1/3*1/3 = 1/9
1/3 + 1/9 = 3/9+ 1/9 = 4/9
1/4*4/9 = 1/9
8/9 + 1/9 = 9/9 = 1
10*1 = 10
1 + 10 = 11
2*11 = 22
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