\(159\left(18-59\right)-599\left(18-159\right)\)
thực hiện phép tính :73.( 8 - 59 ) - 59.( 8 - 73 ) b,159.(18 - 59) - 59( 18 -159) c, -145(13-57) + 57(10 - 145
a,
73.( 8 - 59 ) - 59.( 8 - 73 )
=73.8 -73. 59 - 59.8 - 73.59
=8(73-59)-73(59-59)
=8.14-0
=112
b,Tương tự câu a
c,Tương tự câu a
a) 73 . ( 8 - 59 ) - 59 . ( 8 - 73) b) 159 . ( 18 - 59 ) - 59. ( 18 - 159 ) c) - 145 . ( 13 - 57 ) + 57. ( 10 - 145 )
= 73 . 8 - 73 . 59 - 59 .8 - 59 .73 = 159 . 18 - 159 . 59 - 59 . 18 - 59 . 159 = ( - 145 ) . 13 - (- 145) . 57 + 57 . 10 -57.145
= 8 . ( 72 - 59 ) - 73 . ( 59 - 59 ) = 18 . (159 - 59 ) - ( 59 - 59) - ( 159 - 159) =(-145).13-(-145).57+57.(10-145)
= 8 . 14 - 0 = 1800 - 0 - 0 = (-145).13- (-145).57 + (-135)
= 112 = 1800 = -145.(13 - 57) + (-135)
=6380 + (-135 )
=6245
dddddđrdE2FK4OFifihflifjolfk;ofkw;fk;efkewof;owjvfickdvkfojvds;vjifjsloufikoajewfwokaojadmspojfdcpdsjfpffkfojjfkepggurjd3r0i479ie3kvjuhfjfosjfkf;dlpdl;ldsf[le[fo30ifl;f.a;fle';kfrpkgouhi8typzoogjijgra
156.(18-59)-59.(18-159)
\(156\left(18-59\right)-59\cdot\left(18-159\right)\)
\(=156\cdot18-156\cdot59-59\cdot18+59\cdot159\)
\(=156\cdot18-59\cdot18+59\left(159-156\right)\)
\(=18\left(156-59\right)+59\cdot3\)
\(=18\cdot97+59\cdot3\)
=1746+177
=1923
\(159(18-59)-59(19-159)\)
\(159\left(18-59\right)-59\left(19-159\right)\)
\(=159.\left(-41\right)-59.\left(-140\right)\)
\(=-6519-\left(-8260\right)\)
\(=1741\)
\(159.\left(15-59\right)-59.\left(19-159\right)\)
\(=159.15-159.59-59.19+59.159\)
\(=159.15-59.19=1264\)
159.(18-59)-59.(19-159)
159.-41-59.-140
-6519-(-8260)
1741
7.[6:2-15:(-3)-|3|]
159.(18-59)-59.(16-159)
159.(18-59)-59.(8-73)
159.(18-59)-59.(8-73)
tính hợp lí:
a, 73.( 8 - 59 ) - 59.( 8 - 73 )
b,159.(18 - 59) - 59( 18 -159)
c, -145(13-57) + 57(10 - 145)
giúp mình nha mình tick cho ai làm chi tiết và nhanh nhất
mình phân phối rồi nhưng rắc rối lắm, bn làm giúp mình 1 câu thôi nhé
ban hay su dung quy tac chuyen ve de pha ngoac sau do lay 73 +(-73) roi lan luot su dung tinh chat phan phoi se giai,
dap an 112
Tìm x biết: \(\left(1-\dfrac{52}{53}\right)+\left(\dfrac{105}{106}-1\right)+\left(\dfrac{158}{159}-1\right)=\dfrac{\left|x\right|}{318}\)
\(\left(1-\frac{52}{53}\right)+\left(\frac{105}{106}-1\right)+\left(\frac{158}{159}-1\right)=\frac{\left|x\right|}{318}\)
⇔\(\frac{1}{53}+\frac{-1}{106}+\frac{-1}{159}=\frac{\left|x\right|}{318}\)
⇔\(\frac{1}{138}=\frac{\left|x\right|}{318}\)
⇒\(\left|x\right|=1\)
⇔\(\left[{}\begin{matrix}x=1\\x=-1\end{matrix}\right.\)
Vậy x∈\(\left\{-1;1\right\}\)
Tính bằng cách hợp lí
159.(18-59)-59.(8-73)
159.(18-59)-59.(8-73)=159.(-41)-59.(-65)
=(100+59).(-41)-59.(-65)
=100.(-41)+59.(-41)-59.(-65)
=(-4100)+59.[(-41)-(-65)]
=(-4100)+1416
=-2684