Ai giải giùm mik bài tóa này nha
1 Tính :
a)5+(-5) b)71-52 c)28+(-82) d)47+(-30) e)(-41)+(-59) f)75+(-10) t)26-43 y)90-25 o)72+(-9) p)(-3)+3
2 Tính nhanh :
a)(-150)-47+150-53
b)250+(-90)-250-10+100
c)71+92-28-(-29)+8-72
d)45+(-31)-45+(-31)
3 Tìm x biết :
a)x-5=-15 b)21+x=-79 c)x-15=-23+(-6) d)200-x=/-32/-41
ai giải giùm mik đi gần nộp bài rồi huhu :(((
1) Tính
a, 5 + (-5) = 0
b, 71 - 52 = 19
c, 28 + - (82) = -54
d, 45 + (-31) - 45 + (-30) = 45 + (-31) + (-45) + (-30) = [45 + (-45)] + [(-31) + (30)]
= 0 + (-1) = -1
2)Tìm x
a, x - 5 = -15
x = (-15) + 5
x = -10
b, 21 + x = -79
x = (-79) - 21
x = -100
c, x - 15 = -23 + (-6)
x - 15 = -29
x = -29 + 15
x = -14
d, 200 - x = /-32/ - 41
200 - x = 32 - 41
200 - x = -9
x = 200 - (-9)
x = 209
\(.1.\)
\(.a.\)
\(5+\left(-5\right)\)
\(=5-5\)
\(=0\)
\(.b.\)
\(71-52\)
\(=19\)
\(.c.\)
\(28+\left(-82\right)\)
\(=28-82\)
\(=-54\)
\(.d.\)
\(47+\left(-30\right)\)
\(=47-30\)
\(=17\)
\(.e.\)
\(\left(-41\right)+\left(-59\right)\)
\(=-41-59\)
\(=-100\)
\(.f.\)
\(75+\left(-10\right)\)
\(=75-10\)
\(=65\)
\(.t.\)
\(26-43\)
\(=-17\)
\(.y.\)
\(90-25\)
\(=75\)
\(.o.\)
\(72+\left(-9\right)\)
\(=72-9\)
\(=63\)
\(.p.\)
\(\left(-3\right)+3\)
\(=-3+3\)
\(=0\)
\(.2.\)
\(.a.\)
\(\left(-150\right)-47+150-53\)
\(=\left[\left(-150\right)+150\right]-53-47\)
\(=0-53-47\)
\(=-53-47\)
\(=-100\)
\(.b.\)
\(250+\left(-90\right)-250-10+100\)
\(=\left[250-250\right]+\left[\left(-90\right)-10+100\right]\)
\(=0\)
\(.c.\)
\(71+92-28-\left(-29\right)+8-72\)
\(=71+92-28+29+8-72\)
\(=\left(-28+8\right)+\left(92-72\right)+71+29\)
\(=-20+20+71+29\)
\(=71+29\)
\(=100\)
\(.d.\)
\(45+\left(-31\right)-45+\left(-31\right)\)
\(=45-31-45-31\)
\(=\left(45-45\right)-31-31\)
\(=-31-31\)
\(=-62\)
\(.3.\)
\(.a.\)
\(x-5=-15\)
\(\Rightarrow x=-15+5\)
\(\Rightarrow x=-10\)
\(.b.\)
\(21+x=-79\)
\(\Rightarrow x=-79-21\)
\(\Rightarrow x=-100\)
\(.c.\)
\(x-15=23+\left(-6\right)\)
\(\Rightarrow x-15=23-6\)
\(\Rightarrow x-15=17\)
\(\Rightarrow x=17+15\)
\(\Rightarrow x=32\)
\(.d.\)
\(200-x=\left|-32\right|-41\)
\(\Rightarrow200-x=32-41\)
\(\Rightarrow200-x=-9\)
\(\Rightarrow x=200--9\)
\(\Rightarrow x=209\)
