6.3±0.1和8.4±02的和为多少,差呢?积商?（详细说下）

丨6.3±0.1丨+丨8.4±0.2丨=(6.4+0.1)+(8.4+0.2)=6.5+8.6=15.1
=(6.4-0.1)+(8.4+0.2)=6.3+8.6=14.9
=(6.4+0.1)+(8.4-0.2)= 6.5+8.2=14.7
=(6.4-0.1)+(8.4-0.2)= 6.3+8.2=14.5
丨6.3±0.1丨-丨8.4±0.2丨 =(6.4-0.1)-(8.4-0.2)= 6.3-8.2=-1.9
=(6.4+0.1)-(8.4-0.2)= 6.5-8.2=-1.7
=(6.4-0.1)-(8.4+0.2)= 6.3-8.6=-2.3
=(6.4+0.1)-(8.4+0.2)= 6.5-8.6=-2.1
丨6.3±0.1丨÷丨8.4±0.2丨 =(6.4+0.1)÷(8.4+0.2)=6.5÷8.6 ≈0.7558
=(6.4-0.1)÷(8.4+0.2)=6.3÷8.6 ≈0.7326
=(6.4+0.1)÷(8.4-0.2)= 6.5÷8.2≈0.7927
=(6.4-0.1)÷(8.4-0.2)= 6.3÷8.2 ≈0.7683