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4. Află termenul necunoscut: a) (271+342)+a=718 b) b+(260+170)-810 c) (667-131x2)-a-135 d) b-[1002+(385+150)-1002]=275 e) 3xa=345 f) bx4-872 g) 100:a=50​

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Matiutkarla2006id

Răspuns:

(271+342)+a=718

613+a=718

a=718-613

a= 105

b+(260+170)-810=0

b+430= 810

b= 810-430

b= 380

(667-131×2)-a-135

(667-262)-a-135

405-a=135

-a=135-405

-a= -270

a= 270

b-[1002+(385+150)-1002]=275

b-(1002+535-1002)=275

b-535=275

b= 275+535

b= 810

3×a=345

a=345:3

a= 115

b×4-872

b×4= 872

b=872:4

b= 218

100:a=50

a=100:50

a=2

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