Salut! ♡
b)
[tex](5 {}^{3} \times 25 - 25) {}^{2} [/tex]
[tex](25(5 {}^{3} - 1)) {}^{2} [/tex]
[tex](25(125 - 1)) {}^{2} [/tex]
[tex](25 - 124) {}^{2} [/tex]
[tex]3100 {}^{2} [/tex]
c)
[tex](7 {}^{2} \times 31 + 31 {}^{2} ) \div 2 {}^{4} [/tex]
[tex]31(7 {}^{2} + 31) \div 2 {}^{4} [/tex]
[tex]31(49 + 31) \div 2 {}^{4} [/tex]
[tex]31 \times 80 \div 2 {}^{4} [/tex]
[tex] \frac{31 \times 80}{2 {}^{4} } [/tex]
[tex] \frac{31 \times 80}{16} [/tex]
[tex]31 \times 5 = 155[/tex]
d)
[tex]( {26}^{2} + {2}^{6} \times 26) \div 3 {}^{2} [/tex]
[tex]26(26 + 2 {}^{6} ) \div 3 {}^{2} [/tex]
[tex]26(26 + 64) \div 3 {}^{2} [/tex]
[tex]26 + 90 \div 3 {}^{2} [/tex]
[tex] \frac{26 \times 90}{3 {}^{2} } [/tex]
[tex] \frac{26 \times 90}{9} [/tex]
[tex]26 \times 10 = 260[/tex]
Succes!
