1: ① 20×2.1+﹙26--20﹚×2.9
=42+17.4
=59.4
② 60000×1.2×365
=26280000
③ 略
2: 8÷2=4
4×3.14+3.14×8×2×2
=16×3.14+3.14×8×2×2
=50.24+100.48
=150.72
4×3.14×2
=16×3.14×2
=100.48
提交 重置