a)-5/13-2/23×46/39+(-3/2)²

b)-2/7×125/9×3/14×(-5)

c)13/23×37/23-37/23×11/23+2/23

d)(-2/13×3/5)×(-4/13+6/5)

(/ phần)

Đáp án+Giải thích các bước giải:

 `a)`

`-5/13-2/23×46/39+(-3/2)^2`

`=-5/13-(2×23*2)/(39*23)+9/4`

`=-5/13-4/39+9/4`

`=-15/39-4/39+9/4`

`=-76/156+351/156`

`=275/156`

`b)`

`-2/7×125/9×3/14×(-5)`

`=(2*125*3*5)/(7*3^2*14)`

`=625/147`

`c)`

`13/23×37/23-37/23×11/23+2/23`

`=(-11/23+13/23)×37/23+2/23`

`=2/23×37/23+2/23`

`=2/23×(37/23+1)`

`=2/23*60/23`

`=120/529`

`d)`

`(-2/13×3/5)×(-4/13+6/5) `

`=(-6/65)×(-20/65+78/65) `

`=(-6/65)×58/65 `

`=-348/4225`