2. จงหาผลหาร (ตอบเป็นทศนิยม 3 ตำแหน่ง)
1) 91.538 \(\div\) 0.74
วิธีทำ
91.538 \(\div\) 0.74
= \(\mathsf{\frac{91.538}{0.74} \times \frac{100}{100}}\)
= \(\mathsf{\frac{9,153.8}{74}}\)
= 123.700
ตอบ 123.700
2) (-68.75) \(\div\) 0.03
วิธีทำ
(-68.75) \(\div\) 0.03
= -(68.75 \(\div\) 0.03)
= -(\(\mathsf{\frac{68.75}{0.03} \times \frac{100}{100}}\))
= -(\(\mathsf{\frac{6,875}{3}}\))
\(\approx\) -2,291.667
ตอบ -2,291.667
3) 671.2 \(\div\) (-5.1)
วิธีทำ
671.2 \(\div\) (-5.1)
= -(671.2 \(\div\) 5.1)
= -(\(\mathsf{\frac{671.2}{5.1} \times \frac{10}{10}}\))
= -(\(\mathsf{\frac{6,712}{51}}\))
\(\approx\) -131.608
ตอบ -131.608
4) (-0.089) \(\div\) (-4.3)
วิธีทำ
(-0.089) \(\div\) (-4.3)
= 0.089 \(\div\) 4.3
= \(\mathsf{\frac{0.089}{4.3} \times \frac{10}{10}}\)
= \(\mathsf{\frac{0.89}{43}}\)
\(\approx\) 0.021
ตอบ 0.021