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Efectueaza: a)19 la puterea 0 +17 - (17-16)la puterea 2=




b)2 la puterea 2 × 5+2 la puterea 2×7 -2 la puterea 2×9=




c)8 la putere 2 - 7 la puterea 2 × 7 la puterea 0 -15=


Răspuns :

[tex]a) {19}^{0} + 17 - {(17 - 16)}^{2} [/tex]

[tex] = 1 + 17 - {1}^{2} [/tex]

[tex] = 18 - 1[/tex]

[tex] = 17[/tex]

[tex]b) {2}^{2} \times 5 + {2}^{2} \times 7 - {2}^{2} \times 9[/tex]

[tex] = {2}^{2} (5 + 7 - 9)[/tex]

[tex] = 4(12 - 9)[/tex]

[tex] = 4 \times 3[/tex]

[tex] = 12[/tex]

[tex]c) {8}^{2} - {7}^{2} \times {7}^{0} - 15[/tex]

[tex] = 64 - 49 \times 1 - 15[/tex]

[tex] = 64 - 49 - 15[/tex]

[tex] = 15 - 15[/tex]

[tex] = 0[/tex]

A. 19^0+17-(17-16)^2=1+17- 1^2=18-1=17

B. 2^2×5+2^2×7-2^2×9=4×5+4×7-4×9=20+28-36=48-36=12

C.8^2-7^2×7^0-15=64-49×1-15=64-49-15=15-15=0