Răspuns:
7.
[tex] \frac{475 + 38 \times 10 - 195}{4800 \div 100 - 44} \div 5 \times x = 297 \\ \frac{475 + 380 - 195}{48 - 44} \div 5 \times x = 297 \\ \frac{660}{4} \times \frac{1}{5} \times x = 297 \\ \frac{165}{5} \times x = 297 \\ 33 \times x = 297 \\ x = 9[/tex]
8.
825÷(700-695)+(81÷9-476×0)×x=624
825÷5+9×x=624
165+9x=624
9x=459
x=51
9.
[(x÷7+108)÷4×10-192]÷4=87
(x÷7+108)÷4×10-192=348
(x÷7+108)÷4×10=540
(x÷7+108)÷4=54
x÷7+108=216
x÷7=108
x=756
