第8页 - 江苏版实验班提优训练数学七年级上下册答案

20

2023

2

4

2

102

1

4049

$ \begin{aligned}解：原式&=-4+1-2 \\ &=-5. \\ \end{aligned}$

$ \begin{aligned}解：原式&=-8x⁶+x⁶-9x⁶ \\ &=-16x⁶. \\ \end{aligned}$

$ \begin{aligned}解：原式&=(\frac{9}{4}×4)² \\ &=81. \\ \end{aligned}$

$ \begin{aligned}解：原式&=(-0.25)¹²×4¹²×4 \\ &=(-0.25×4)¹²×4 \\ &=(-1)¹²×4 \\ &=1×4 \\ &=4. \\ \end{aligned}$

$ \begin{aligned}解：原式&=(-8)^{2}×(-8)^{55}×( \frac{1}{8} )^{55} \\ &=(-8)^2× (-8× \frac{1}{8} )^{55} \\ &=(-8)^2×(-1) \\ &=-64. \\ \end{aligned}$

$ \begin{aligned}解：原式&=(- \frac{1}{18} )²×(- \frac{1}{18} )²º²²×3×3²⁰²²×6²⁰²² \\ &=(-\frac{1}{18} )²×3×(- \frac{1}{18} ×3×6)²º²² \\ &=\frac{1}{108}. \\ \end{aligned}$