Đinh Nguyễn Anh Thuỷ
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2023-11-02 20:38:24
a)x+2/5=-4/3
×=-4/3-2/5
×=-4/3+-2/5=-20/15+-6/15=-26/15
b)-5/6+1/3×x=(-1/2)^2
-5/6+1/3×x=1/4
1/3×x=1/4+5/6
1/3×x=3/12+10/12
1/3×x=13/12
x=13/12÷1/3
x=13/12×3/1=13/4
c)7/12-(x+7/6)×6/5=(-1/2)^3
7/12-(x+7/6)×6/5=-1/8
(x+7/6)×6/5=7/12-(-1/8)
(x+7/6)×6/5=17/24
x+7/6=17/24÷6/5
x+7/6=85/144
x=85/144-7/6
×=85/144-168/144
x=85/144+-168/144=-83/144
2023-11-02 20:22:50
a)4/9+1/4=16/36+9/36=25/36
b)1/3×(-4/5)+1/3×-1/5+2023^0
=1/3×(-4/5+-1/5)+2023^0
=1/3×-1+2023^0
=-1/3+2023^0
=-1/3+1
=-1/3+3/3=2/3
c)1/5-(1/4-(1-1/2)^2)
=1/5-(1/4-(1/2)^2)
=1/5-(1/4-1/4)
=1/5-0=1/5