Question

7. Află valoarea lui x din egalităţile:
(x x 2-40) : (32 : 8) = 5;
(48 - x): 2-9:3+ 5 = 10;
36 + 6 x 9-(x:3 +15)= 42.​

Answer 1

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Carinacrina

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A) {[(80-30)-25]:5+[(100:10-20:2)]:5}•3

={[(50-25):5+(10-10)]:5}•3

=[(25:5+0):5•3

=(5:5)•3=1•3=3

B) 9+{9+9•[9+9•(9-9:3)]}

=9+{9+9•[9+9•(9-3)]}

=9+[9+9•(9+9•6)]

=9+(9+9•63)

=9+(9+567)=9+576=585

C) 4+3•8+{[(3•8-6)+2•3]:4+6}

=4+24+[(18+6):4+6]

=4+24+(24:4+6)

=4+24+12=40

D) 1+{2•[3+(14+16):5]-54:9}•63:7

=1+[2•(3+30:5)-6]•9

=1+(2•9-6)•9

=1+12•9=1+108=109

E)7+[25•4:10+5•(36-2•15)]:8

= 7+100:10+5•(36-30)]:8

=7+(10+5•6):8

=7+40:8=7+5=12

F) 36+{24:3+5•[40+6•(32:8-24•0:1)]}

=36+{8+5•[40+6•(4-0:1)]}

=36+[8+5•(40+6•4)]

=36+(8+5•64)

=36+(8+320)=36+328=364

G) 20•{[(4•32+3•4):10]:2+48:8}

=20•{[(128+12):10]:2+6}

= 20•[(140:10):2+6]

=20•(14:2+6)

=20•(7+6)=20•13=260