Question

Determină valoarea lui ,,a":
a - 28+ (14 x 5: 7- (21: 3)] + 175 = 500
a + 19 - (24 x 5:2-(16 x 3)] +238 = 480
a - 57 + [29 x 3 x 5 - (25 x 8)] + 602 = 865
a + 49 - (17 x 6 x 9 - (92 x 7)] + 318 = 443
Va rog urgent ‼​

Answer 1

Răspuns:

a-28+[14×5:7-(21:3)] + 175=500

a - 28 + (70:7-7) +175=500

a - 28 + (10-7) + 175=500

a - 28 + 3 + 175 = 500

a - 28 + 178 = 500

a - 28 = 500 - 178

a - 28 = 322

a = 322 + 28

a = 350

a + 19 - [24 x 5:2-(16 x 3)] +238 = 480

a + 19 - (120:2-48)+238=480

a+19-(60-48)+238=480

a+19-12+238=480

a+19-12=480-238

a+19-12=242

a+19=242+12

a+19=254

a=254-19

a=235

a - 57 + [29 x 3 x 5 - (25 x 8)] + 602 = 865

a-57+(87×5-200)+602=865

a-57+(435-200)+602=865

a-57+235+602=865

a-57+837=865

a-57=865-837

a-57=22

a=22+57

a=79

a + 49 - (17 x 6 x 9 - (92 x 7)] + 318 = 443

a+49-(102×9-644)+318=443

a+49-(918-644)+318=443

a+49-274+318=443

a+49-274=443-318

a+49-274=125

a+49=125+274

a+49=399

a=399-49

a=350