(1) 1.25 × 32 × 2.5 (2) 7.25-337 + 3.75-647 (3) 0.625 × 12.2-58 × 3.2 + 58

(1) 1.25 × 32 × 2.5 (2) 7.25-337 + 3.75-647 (3) 0.625 × 12.2-58 × 3.2 + 58

（1）1.25×32×2.5，=1.25×8×4×2.5，=（1.25×8）×（4×2.5），=10×10，=100；（2）7.25-337+3.75-647，=（7.25+3.75）-（647+337），=11-10，=1；（3）0.625×12.2-58×3.2+58，=0.625×12.2-0.625×3.2+0.62...

5 × 0.75 + 7.5 × 75% 5 / 8-5 / 6 × (1 / 4-25%)
5 × 0.75 + 7.5 × 75% 5 / 8-5 / 6 × (1 / 4-25%)

8×75%-3÷3/4
=8×3/4-4
=6-4
=2
8.5×0.75＋7.5×75%
=8.5×0.75＋7.5×0.75
=0.75×（8.5+7.5）
=3/4×16
=12
5/8-5/6×（1/4－25%）
=5/8-5/6×（1/4-1/4）
=5/8-5/6×0
=5/8-0
=5/8
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