(1/4-1/6+1/2)×(-12)=?(-49)×(-32)+(-51)×(+32)=?(-8/9)×(-0.25)×(1-1/4)×9=?

问题描述:

(1/4-1/6+1/2)×(-12)=?(-49)×(-32)+(-51)×(+32)=?
(-8/9)×(-0.25)×(1-1/4)×9=?

1.(6/24-4/24+12/24)x(-12)=7/12x(-12)=-7
2.1472-1632=-64
3.(-8/9)x(-1/4)x3/4x9=3/2

1、1/4 × 12 + 1/6 ×12 + 1/2 × 12 =3+2+6=11
2、(-49+51)×(-32)=2×(-32)=-64
3、9×(-8/9)×(-0.25)×(1-1/4)=(-8)×(-0.25)×3/4 = 2×3/4 =3/2