Explicație pas cu pas:
ex:5
c)xy+xz=42
x(y+z)=42
x×7=42
x=42÷7
x=6
e)3x+5y+2z=3×3+5×3×5+2×5=9+75+10=94
ex:6
b)5²+2⁵-2=25+32-2=55
e)[2⁴×2³+(3⁵)²]÷(2⁵×2²+3¹²÷3²)=
[2⁷+3¹⁰]÷(2⁷+3¹²÷3²)=
[2⁷+3¹⁰]÷(2⁷+3¹⁰)=
2⁷+3¹⁰÷2⁷+3¹⁰=
1
g)(2⁴×3²)⁸÷(2²×3)¹⁵-2¹¹÷2⁹=
(2⁴)⁸×(3²)⁸÷(2²)¹⁵×3¹⁵-2¹¹÷2⁹=
2³²×3¹⁶÷2³⁰×3¹⁵-2¹¹÷2⁹=
3³¹+2²-2¹¹÷2⁹=
3²¹+2²-2²=
3³¹
