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1/2×(2×x-3)+105/2=-137/2
1/2×(2×x-3)=-137/2-105/2
1/2×(2×x-3)=-242/2
2×x-3=-242/2:1/2
2×x-3=-242
2.x=(-242)+3
2.x=239
x=239:2
x=239/2
A,-12×25-25×75-25×13
=[(-12)-75-13].25
=(-100).25
-2500
B,-50/7×49/10-35/2×-10/7+ -25/3× -9/5
=(-35)-(-25)+(-13)
=-23
C,-354+265-156+125
=[(-354)-156]+(265+125)
=(-510)+277
=-233
D,-74+40-50+16-35
=(-74)+40+(-50)+16+(-35)
=[(-74)+(-35)]+[40+(-50)+16]
=(-109)+26
=-83
E,-2/3×4/5+-4/5×4/3-0,125
=-2/3.4/5+4/5.(-4/3)-0,125
=4/5.[-2/3+(-4/3)]-0,125
=4/5.(-2)-0,125
=-8/5-0,125
=(-1,6)+(-0,125)
=-1,725
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a)(-25)+15+x=50
(-10)+x=50
x=50-(-10)
x=50+10
x=60
b)(-25)+15+x=-35
(-10)+x=-35
x=(-35)-(-10)
x=(-35)+10
x=-25
c)(-25)+15+x=-10
(-10)+x=-10
x=-10-(-10)
x=-10+10
x=0
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a)2.(50+35):(-20+3)
=(2.50+35.2):(-20+3)
=(100+70):(-17)
=170:(-17)
=-10
b)(-4).17+(-4).83-(-50)
=(-4).(17+83)-(-50)
=(-4).100-(-50)
=-400-(-50)
=-350
c)10.(-8)+(-10).(-8)
=(-80)+80
=0
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a) 25+(-15)+(-x)=50
10+(-x)=50
-x=50-10
-x=40
x=40
b) 25+(-15)+(-x)=-35
10+(-x)==-35
-x=-35-10
-x=-45
x=45
c) 25+(-15)+(-x)=-10
10+(-x)=-10
-x=-10-10
-x=-20
x=20
Ta có : 50 - (x - 10) = 35
=> x - 10 = 50 - 35 = 15
=> x = 15 + 10
=> x = 25
50 - (x - 10) = 35
=> x - 10 = 50 - 35
=> x - 10 = 15
=> x = 10 + 15
=> x = 25