Question

                                         aflati valuarea nr necunoscut:

445+5xb egal 990

752/8+483-990/3-d egal 100

c/8+69x9-674 egal 734

e-388/+603/3-506 egal 224

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Answer 1

445+5xb=990
5b=990-445
5b=545
b=545:5
b=109
752/8+483-990/3-d = 100
94+483-330-d=100
94+483-330-100=d
d=147
c/8+69x9-674=734
c:8+69x9=734+674
c:8+69x9=1408
c:8+69=1408:9
c:8+69=156
c:8=156-69
c:8=87
c=87x8
c=696
e-388/+603/3-506 = 224
e-388+201-506=224
e=224+506-201+388
e=917