(-98)×(-0.125)+98×1/8×(-4/7)
=98×1/8×(1-4/7)
=98×1/8×3/7
=21/4
63×(-1又九分之一)+(-18)/(-0.9)
=63×(-10/9)+(-18)/(-9/10)
=10/9×(18-63)
= - 50
|3-4|+3又二分之一 ÷ (-1又四分之三) - (-1/3) ×3
=1-7/2×4/7+1
=0
2又4/5 × (-4/7) +8.75 ×(-4/7) +1.2×(-4/7) - 2又3/4 × (-4/7)
=(-4/7)× (14/5+35/4+6/5-11/4)
=-40/7
-2/3+(-1/6)-(-1/4)-1/2
=-4/6-1/6+1/4-2/4
=-13/12
-5/3×(0.5-2/3)÷ 10/9
=5/3×1/6×9/10
=1/4
42×(-2/3)+(-3/4)÷(-0.25)
= - 28+(3/4)×4
= - 25
(-56)÷(-12+8)+(-2)×5
=14-10
=4