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a+b+c=32 2a+b+2c=57 calculati ( a+c)(3a+2b+3c)

Răspuns :

Andrew55

1. calculati ( 3a+2b+3c):

  a+  b+  c=32 + (adunam cele 2 relatii)

2a+  b+2c=57

____________

3a+2b+3c=32+57=89

2. calculati ( a+c):

2a+  b+2c=57   - (scadem cele 2 relatii)

a+    b+  c=32

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a     +    c=57-32=25


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