Tính nhanh
a) (-147-173)-(127+247)
b)(-155)×61+155×(-38)-155
c)(-325)×(425-27)-425×(27-325)
d)(-6)×43+45×(-6)+12×(-6)
e) 5×(18-105)-105×(18-5)
Tính nhanh : a)(-147-173)-(127+247)
b)(-155)×61+155×(-38)-155
c) (-325)×(425-27)-425×(27-325)
d) (-6)× 43 +45×(-6)+12×(-6)
e) 5×(18-105)-105×(18-5)
tính nhanh
(-6).43+45.(-6)+12.(-6)
5.(-18-105)-105.(18-5)
(-6).43+45.(-6)+12.(-6)=(-6).(43+45+12)=(-6).100=(-600)
5.(-18-105)-105.(18-5)=5.(-18)+5.(-105)-105.(-18)+105.5=5.(-18)-105.(-18)=(-18).100=(-1800)
TICK MIK NHÉ.MIK TRẢ LỜI NHAH NHỨT NÈK
(-6).43+45.(-6)+12.(-6)=-600
5.(-18-105)-105.(18-5)=-2480
tinh nhanh:
a, (-6).43+45.(-6)+12.(-6)
b, 5.(18-105)-105.(18-5)
a. (-6) . 43 + 45.(-6) + 12.(-6)
= (-6) . (43 + 45 + 12)
= (-6) . 100
= -600
b. 5.(18 - 105) - 105.(18 - 5)
= 5.18 - 5.105 - 105.18 + 105.5
= 5.18 - 105.18
= 18.(5 - 105)
= 18.(-100)
= -1800
= (-6) . (43+45+12) = (-6) . 100 = (-600)
Tính hợp lí:
(-325). (425-27) - 425. (27-325)
\(\left(-325\right).\left(425-27\right)-425.\left(27-325\right)\)
\(=\text{ }\left[\left(-325\right).425-\left(-325\right).27\right]-\left(425.27-425.325\right)\)
\(=\left(-325\right).425-\left(-325\right).27-425.27+425.325\)
\(=\text{ }\left[\left(-325\right).425+425.325\right]-\text{ }\left[\left(-325\right).27+425.27\right]\)
\(=\text{ }\left\{425.\text{ }\left[\left(-325\right)+325\right]\right\}-\text{ }\left\{27.\text{ }\left[\left(-325+425\right)\right]\right\}\)
\(=\left(425.0\right)-\left(27.100\right)\)
\(=0-2700\)
\(=-2700\)
Tính nhanh
a) -(168+325)+(168+425)
b) (38-276)+(38-65+276)
c)(269+135)+(-327-169)-(135-27)
d)271-[(-43)+271-(-17)
a,-(168+325) + ( 168 + 425 )
= -168 - 325 + 168 + 425
= [ ( -168 ) + 168 ] + [ ( -325 ) + 425]
= 0 + 100
= 100
a,750
b,11
c,-200
d,26
-(168+325)+(168+425) = (-168+168)+(-325+425)= 0+100= 100
(38-276)+(38-65+276)=(38-38-65)+(276-276)=-65+0=-65
(269+135)+(-327-169)-(135-27)= (269-169)+(135-135)+ (327-27)=100+0+300= 400
271-(-43)+271-(-17)= (271-271)+(43+17)= 0+ 60=60
Chúc bạn học tốt
Tính hợp lý :
a) ( -75 ) + ( -325 ) + | -45 | - ( - 125 )
b) 62 + | 128 | - | - 155 | - | 70 |
c) 815 + [ 95 + ( -815 ) + -45 ) ]
d ) 5 + ( -7 ) + 9 + ( -11 ) + ... + 25 + ( -27 )
e ) 34 + 35 + 36 + 37 - 24 - 25 - 26 - 27
g) ( -100 ) + 112 + ( -114 ) + ... + ( - 198 ) + 200
GIÚP MÌNH VỚI CÁC BẠN ƠI HUHU !!!!
a) \(-75+\left(-325\right)+\left|-45\right|-\left(-125\right)\)
\(=-75-325+45+125\)
\(=\left(45+125\right)-\left(75+325\right)\)
\(=170-400\)
\(=-230\)
b) \(62+\left|128\right|-\left|-155\right|-\left|70\right|\)
\(=62+128-155-70\)
\(\Leftrightarrow190-225\)
\(=-35\)
c) \(815+\left[95+\left(-815\right)+\left(-45\right)\right]\)
\(=815+95-815-45\)
\(=\left(815-815\right)+\left(95-45\right)\)
\(=0+50\)
\(=50\)
d) \(5+\left(-7\right)+9+\left(-11\right)+...+25+\left(-27\right)\)
\(=\left(5-7\right)+\left(9-11\right)+...+\left(25-27\right)\)
\(=-2-2-...-2\)
\(=-2.11\)
\(=-22\)
e) \(34+35+36+37-24-25-26-27\)
\(=\left(34-24\right)+\left(35-25\right)+\left(36-26\right)+\left(37-27\right)\)
\(=10+10+10+10\)
\(=40\)
a.85 x (35-27) -35 x(85-27)
b.(-45)x 69 + 30 x (-45)+ (-45)
c.26 + 7 x (4-12)
d.127 - 18 x(5+6)
a,
=85.35-85.27-35.85+35.27
=85.35+85.(-27)-35.85+35.27
=85[35+(-27)+(-35)]+35.27
=85.(-27)+35.27
=-85.27+35.27
=27.[(-85)+35]
=27.(-50)
=-1350
các câu còn lại cũng vậy
a, 85 x ( 35- 27 ) - 35 x ( 35 - 27 )
85 x 8 - 35 x 8
8 x ( 85 - 35 )
8 x 50 = 400
b, ( -45 ) x 69 + 30 x ( -45 ) +( -45)
( -45 ) x ( 69 + 30 + 1)
-45 x 100 = -4500
c , 26 + 7 x ( 4 - 12 )
26 + 7 x ( - 8 )
26 + ( -56 )=(- 30)
d , 127 - 18 x ( 5 + 6 )
127 - 18 x 11
127 - 180 + 18
-53 + 18 = - 35
a.85x(35-27)-35x(85-27)
=85x8-35x58
=680-2030
=(-1350)
b.(-45)x69+30x(-45)+(-45)
=(-3105)+(-1350)+(-45)
=1800+(-45)
=1755
c.26+7x(4-12)
=26+7x(-8)
=26+(-56)
=(-30)
d.127-18x(5+6)
=127-18x11
=127-198
=(-71)
li-ke cho mình nha bạn
tính nhanh : a, 9 x 12 x25 b, 12 x 125 x 54 c, 8 x 9 x 14 + 6 x 7 x 12 + 19 x 4 x 18 d, 425 x 7 x 4 - 170 x 60 e, 1 + 5 + 9 + 13 + ... + 57 + 61 + 65
a,9.3.4.25
= 27.100
= 2700
b, 12.125.54
= 3.4.125.54
= 125.4.3.54
= 500.162
= 81000
c: \(=72\cdot14+72\cdot7+72\cdot19=72\cdot40=2880\)
d: \(=1700\cdot7-1700\cdot6=1700\)
e: Số số hạng là (65-1)/4+1=17(số)
Tổng là: \(\dfrac{65+1}{2}\cdot17=33\cdot17=561\)
a/317+(600-x)=517
b/325-(x+16)=425:17
c/25*(x-1)=0
d/713:(2x+17)=23
e/(x+a/3)*7/4=5-7/6