2. The original formula =-P? q?
3. The original formula =2a? 4×2b? four
4. The original formula =a? 8+a? 8-2a? 8=0
5. Original formula = 18x? y
6. Original formula =-6a? b?
7. Original formula =-4x? y?
8. The original formula = 1.3×3.8× 10? 5× 10? =4.94× 10? eight
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