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[(5 x a +178)] x15 +90:45=63.sa se calculeze valoarea lui a.

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[( 5× a + 178)] x 15 + 90 : 45 = 63
[(5 × a+178)] × 15 +2=63
[ ( 5 × a + 178)] × 15 = 63 - 2
[ ( 5 × a+178)]×15 = 61
[(5×a+ 178 )] = 61 × 15
[( 5×a+ 178 )] = 915
5×a = 915 - 178
5×a=737
a= 737 : 5
a= 147 r 4
[(5×a+178)]x15+90:45=63
[(5×a+178)]×15+90=2835
[(5×a+178)]×15=2 745
[(5×a+178)]=2745:15=183
5×a=183-178
5×a=5
a=5:5=->a=1
P:[(5×1+178)]×15+90:45=63

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