Question

(-2/5)+(-5/6)-(-4.9)-0.6用全部化成分数的形式计算

9/4×(-6/7)÷(1/2-2)

Answer 1

(-2/5)+(-5/6)-(-4.9)-0.6
=(-2/5)+(-5/6)+49/10+(-3/5)
=49/10+[ (-2/5)+(-3/5) +(-5/6) ]
=49/10 +(-11/6)
=147/30+(-55/30)
=147/30-55/30
=46/15

9/4×(-6/7)÷(1/2-2)
=9/4×(-6/7)÷(-3/2)
=9/4×(-6/7)×(-2/3)
=9/4×6/7×2/3
=9/7

Answer 2

原式＝－5＆＃47；2－5＆＃47；6＋49＆＃47；10－3＆＃47；5下一步把分母都化成最小公倍数计算＝－75＆＃47；30－25＆＃47；30＋147＆＃47；30－18＆＃47；30＝29＆＃47；30