tinh nhanh
(-25).(-191)
tinh nhanh
a)(-25).(-191)
b)(-6-3).(-6+3)
c)35.(-2)4+(-34).16
d)33.(-17+5)+(-67).12
a) = 4775
b) = 27
c) = 16
d) =- 1200
Tinh nhanh 191/210+161/240+129/272+95/306
Bấm máy tính là nhanh nhất!
Kết quả là: 149/63
Tính nhanh
b) (-44) + 25 + (-15) + 44 c) 201 + (-197) + (-201)
d)191 + (-200) + 91 d) (-158) + [(-23) + 158] e) (-2021) - [(-2021) + 25]
b: \(\left(-44\right)+25+\left(-15\right)+44\)
\(=\left(-44+44\right)+\left(25-15\right)\)
=0+10
=10
c: \(201+\left(-197\right)+\left(-201\right)\)
\(=\left(201-201\right)+\left(-197\right)\)
=0-197
=-197
d: \(191+\left(-200\right)+91\)
\(=191+91-200\)
\(=91-9\)
=82
d: \(\left(-158\right)+\left[\left(-23\right)+158\right]\)
\(=-158-23+158\)
\(=\left(-158+158\right)-23\)
=0-23
=-23
e: \(\left(-2021\right)-\left[\left(-2021\right)+25\right]\)
\(=-2021+2021-25\)
=0-25
=-25
a) 191 + X + 9 = 43 x 5 b) X x 25 x 4 = 125 x 8
Nhanh mk tk !
Tinh nhanh:125+125+125+125-25-25-25-25
125 + 125 + 125 + 125 - 25 - 25 - 25 - 25
= ( 125 - 25 ) + ( 125 - 25 ) + ( 125 - 25 ) + ( 125 - 25 )
= 100 + 100 + 100 + 100
= 100 x 4
= 400
Tinh nhanh : -25 . 72 + 25 . 21 - 49 . 25
-25 , 72 + 25 .21 - 49 . 25
=25 . -72 + 25 . 21 - 49 . 25
=25 . (-72 + 21 - 49)
=25 . -100
=-2500
k mk nha
\(-25.72+25.21-49.25\\ =25.\left(-72+21-49\right)\\ =25.\left(-100\right)\\ =-2500\)
-25 . 72 + 25 .21 - 49 .25 = 25 . (-72) + 25 .21 - 49 .25
= 25 ( -72 + 21 -49 ) = 25 . (-100) = -2500
: Tinh nhanh
. 64*25+35*25+25
64 x 25 +35 x 25 +25
=(64+35+1) x 25
=100 x 25
=2500
64 x 25 + 35 x 25 + 25
= ( 64 + 35 + 1 ) x 25
= 100 x 25
= 2500
tinh nhanh 25×(32+47)-32×(25+47)
tinh nhanh (13+25)+(24-13-42-25)