Question

2道计算题~要过程~

180°-65°15′-78°51〃
若∠AOB=39°，∠BOC=21°，试求∠AOC的度数

Answer 1

180°-65°15′-78°51〃=179°60′-65°15′-78°51〃=114°45′-78°51〃=114°44′60〃-78°51〃
=36°44′5〃

∠AOC=∠AOB-∠BOC=39°-21°=18°
或者∠AOC=∠AOB+∠BOC=39°+21°=60°

Answer 2

aoc=aob+boc=39+21=60度
或
aoc=aob-boc=39-21=18度

Answer 3

180°-65°15′-78°51〃=180°-143°15′51〃=36°84′49〃
∠AOC=180°-39°-21°=120°

Answer 4

我会第二题，分两种情况1.∠AOB-∠BOC=39°-21°=18°
2..∠AOB+∠BOC=39°+21°=60°

Answer 5

=180°-(65°15′+78°51〃)
=179°59′60〃-143°15′51〃
=36°44′9〃
∠AOC=39°+21°=60°
或∠AOC=39°-21°=18°