<span>3,06:0,9x=17:10
</span>3,06 × 10 = 0,9х × 17
<span>30,6 = 15,3х
х = 2</span>
1) 24/36
2)30/36
3)33/36
4)42/36
1) (х + 512) - 403 = 509 2) 803 - (352 + у) = 413
х + 512 = 509 + 403 352 + у = 803 - 413
х + 512 = 912 352 + у = 390
х = 912 - 512 у = 390 - 352
х = 400 у = 38
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3) (201 - х) + 633 = 750 4) 721 + 189 = (910 - b)
201 - х = 750 - 633 910 - b = 910
201 - х = 117 b = 910 - 910
х = 201 - 117 b = 0
х = 84