Tinhd nhanh nếu có :
d) 89,23 : 18 + 90,77 : 18
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a)29 . (19 – 13) – 19 . (29 – 13)
= 29 . 6 – 19 . 16
= 174 – 304
= –130.
b)31.(-18)+31.(-81)-31
= 31. [-18 + (-81) - 1 ]
= 31. (-100)
= -3100
c)(7.3-3):(-6)
(7.3-3):(-6)
= (21-3):(-6)
= 18 : (-6)
= 3
d)72:[(-6).2+4)]
= 72 : ( -12 + 4 )
= 72 : -8
= -9
a: \(\left(2345+45\right)-2345\)
\(=2345+45-2345\)
\(=45+\left(2345-2345\right)\)
=45+0
=45
b: \(\left(-2010\right)-\left(119-2010\right)\)
\(=-2010-119+2010\)
\(=\left(-2010+2010\right)-119\)
=0-119
=-119
c: \(\left(18+29\right)+\left(158-18-29\right)\)
\(=18+29+158-18-29\)
\(=158+\left(18-18\right)+\left(29-29\right)\)
=158+0+0
=158
d: \(126+\left(-20\right)+2004+\left(-106\right)\)
\(=126-20+2004-106\)
\(=\left(126-20-106\right)+2004\)
=0+2004
=2004
e: \(\left(-199\right)+\left(-200\right)+\left(201\right)\)
\(=-199-200+201\)
\(=-199+\left(201-200\right)\)
=-199+1
=-198
f: \(99+\left(-100\right)+101\)
\(=\left(99+101\right)-100\)
=200-100
=100
g: \(217+\left[43+\left(-217\right)+\left(-23\right)\right]\)
\(=217+43-217-23\)
\(=\left(217-217\right)+\left(43-23\right)\)
=0+20
=20
a (18+29)+(158-18-29)=18+29+158-18-29=158
b,(13-135+49)-(13+49)=13-135+49-13-49=-135
(18+29)+(158-18-29)
=18+29+158-18-29
=158+(18-18)+(29-29)
=158+0+0
=158
\(=\left(-\dfrac{28}{33}-\dfrac{5}{33}\right)+\left(-\dfrac{18}{47}-\dfrac{29}{47}\right)=-1-1=-2\)
Bài 1.Tính hợp lí(nếu có thể)
a,(-123)+|-18|+23+(-18)
c,124.23+134.17-40.34
d,325-5.[4^3-(27-5^2):1^18]
a,(-123)+|-18|+23+(-18)
= [(-123)+23]+[(-18)+18]
= -100
- Hok tốt ~ K mk nhak.
c,124.23+134.17-40.34
= 124.23+67.2.17-40.34
= 124.23+67.34-40.34
= 124.23+34.27
= 2852+918
= 3770
- Hok tốt ~ K mk nhak
{[83 - (42.10+22.5):18] + 27}.32 + 100 = {[83 - 180:18]+27}.9 + 100 = {73 + 27}.9 +100 = 900 + 100 = 1000
89,23 : 18 + 90,77 : 18
= (89,23 + 90,77) : 18
= 180 : 18
= 10
\(d,89,23\div18+98,77\div18.\)
\(=89,23\times\frac{1}{18}+99,77\times\frac{1}{18}\)
\(=\frac{1}{18}\left(89,23+90,77\right)\)
\(=\frac{1}{18}.180=\frac{180}{18}=10\)