1: ⑴ B ⑵ A ⑶ C
2: 10600 520 520
560 0.026 26
3: (10x6+10x4+6x4)x2
=(60+40+24)x2
=248
3.14x2x4x5+3.14x4x2
=3.14x2x4x5+3.14x16x2
=125.6+100.48
=226.08
提交 重置