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DeniysaD
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(19+7×b)×8:5+85=261 Ma puteti ajuta??

Răspuns :

EagleEyes
(19+7×b)×8:5+85=261 
(19+7b)*8/5 + 85 = 261
(152 + 56b)/5 + 85 = 261
152 + 56b + 425 = 1305
577 + 56b = 1305
56b + 1305 - 577
56b = 728
b = 13 
EuElisa
(19+7*b)*8:5=261-85
(19+7*b)*8:5=176
(19+7*b)*8=176*5
(19+7*b)*8=880
(19+7*b)=880:8
(19+7*b)=110
7*b=110-19
7*b=91
b=91:7
b=13

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