Tính
Giúp e bài 2 ạ
----- Nội dung ảnh -----
**BÀI GIẢI:**
1) Tính
a) \( 5.9 \cdot 10^{6} - 4.3 \cdot 10^{8} \)
\( 15 \cdot 2.10^{6} - 7.29.10^{9} \)
\( 15 \cdot 2 + 5 - 9 = 1025 \)
\( \frac{7}{2} + \frac{7}{8} = \frac{7}{90} \)
b) \( A = -7 + 7^{2} + 7^{3} + 7 + 2019 \)
\( 15 + 3 + 18 \)
c) \( x - 2 = \frac{x - 2}{3} + \frac{x - 2}{4} + \frac{x - 2}{5} = 0 \)
\( 1 + 2 + x + 3 + x + 4 \)
d) \( (x + 3)^{2} + (y - 2)^{4} = 0 \)
e) \( (2x + 3)(y - 2) = 6 \quad (với \, x \in \mathbb{Z}) \)
2) \( x \in \mathbb{Z} \) để:
\( A: \frac{x - 7}{x + 1} \in \mathbb{Z} \quad (x \neq -1) \)
----- Nội dung ảnh -----
**BÀI GIẢI:**
1) Tính
a) \( 5.9 \cdot 10^{6} - 4.3 \cdot 10^{8} \)
\( 15 \cdot 2.10^{6} - 7.29.10^{9} \)
\( 15 \cdot 2 + 5 - 9 = 1025 \)
\( \frac{7}{2} + \frac{7}{8} = \frac{7}{90} \)
b) \( A = -7 + 7^{2} + 7^{3} + 7 + 2019 \)
\( 15 + 3 + 18 \)
c) \( x - 2 = \frac{x - 2}{3} + \frac{x - 2}{4} + \frac{x - 2}{5} = 0 \)
\( 1 + 2 + x + 3 + x + 4 \)
d) \( (x + 3)^{2} + (y - 2)^{4} = 0 \)
e) \( (2x + 3)(y - 2) = 6 \quad (với \, x \in \mathbb{Z}) \)
2) \( x \in \mathbb{Z} \) để:
\( A: \frac{x - 7}{x + 1} \in \mathbb{Z} \quad (x \neq -1) \)