c/ (-55).(-25).[-(-8)]
a) (-10).35+10.(-12)-(-10)
b)20.(-345)+(-20).(-315)
c)25.(27-55)-27.(25-55)
d)25.(-415)+9(-15).418
e)5+(-8).3
MÌNH ĐANG CẦN GẤP NHA
a: \(\left(-10\right)\cdot35+10\cdot\left(-12\right)-\left(-10\right)\)
\(=\left(-10\right)\cdot35+\left(-10\right)\cdot12-\left(-10\right)\)
\(=-10\left(35+12-1\right)=-10\cdot46=-460\)
b: \(20\cdot\left(-345\right)+\left(-20\right)\cdot\left(-315\right)\)
\(=20\cdot\left(-345\right)+20\cdot315\)
\(=20\left(-345+315\right)=-30\cdot20=-600\)
c: \(25\left(27-55\right)-27\left(25-55\right)\)
\(=25\cdot27-25\cdot55-27\cdot25+27\cdot55\)
\(=27\cdot55-25\cdot55=2\cdot55=110\)
d: \(25\cdot\left(-415\right)+9\cdot\left(-15\right)\cdot418\)
\(=-25\cdot415-9\cdot15\cdot418\)
\(=-5\left(5\cdot415+3\cdot9\cdot418\right)\)
\(=-5\left(2075+11286\right)=-5\cdot13361=-66805\)
e: \(5+\left(-8\right)\cdot3\)
=5-24
=-19
Tính theo cách hợp lí:
a) (68 - 8) . 14 + (-27 - 33) . 15
b) 37 . (55 - 49) - 49 . (55 - 37)
c) (-4) . 19 . (-8) . (-25) . (125)
d) 32 . (-125) . 17 . (-25)
a) (68 - 8) . 14 + (-27 - 33) . 15
=60.14+(-60).15
=-60.(15-14)
=-60.1
=-60
b) 37 . (55 - 49) - 49 . (55 - 37)
=37.55-37.49-49.55-49.37
=37.55-49.55
=55(37-49)
=55.(-12)
=-660
c) (-4) . 19 . (-8) . (-25) . (125)
=[-4.(-25)].[-8.(-125)].19
=100.1000.19
=1900000
d) 32 . (-125) . 17 . (-25)
=(32.17).[-125.(-25)]
=544.3125
=1700000
Tính
a, -13 . ( -1 - 35 ) -25 . 13
b, ( -4 ) . 125 . ( -25 ) . ( -6 ) . ( -8 )
c, ( -18 ) . ( 55 - 24 ) - 28 . ( 44 - 68 )
Làm giùm, cần gấp
(-12).(7-72) -25.(55-42)
(39-19).(-2)+(34-22).5
25.(-2)3+25:(3-8)2
b: =20x(-2)+12x5
=-40+60
=20
Tính nhanh
18 . 26 . 25 . 9
2 . 450 . 25 . 8
55 . 17 .16 . 15
125 . 98 . 2 . 8 . 25
15 . 6 . 4 . 125 . 8
18 . 26 . 25 . 9
= ( 18 . 25 ) . ( 26 . 9 )
= 450 . 234
= 105 300
2 . 450 . 25 . 8
= ( 2 . 450 ) . ( 25 . 8 )
= 900 . 200
= 180 000
55 . 17 .16 . 15
( 15 . 16 ) . ( 55 . 17 )
= 240 . 935
= 224 400
125 . 98 . 2 . 8 . 25
( 25 .8 ) . ( 125 . 2 ) . 98
= 200 . 250 . 98
= 50 000 . 98
= 4 900 000
15 . 6 . 4 . 125 . 8
= ( 125 . 4 ) . ( 15 . 8 ) . 6
= 500 . 120 . 6
= 60 000 . 6
= 36 000
chúc bạn may mắn . tick cho mình nhé !
Tính nhanh
18 . 26 . 25 . 9
2 . 450 . 25 . 8
55 . 17 .16 . 15
125 . 98 . 2 . 8 . 25
15 . 6 . 4 . 125 . 8
Tính nhanh
18 . 26 . 25 . 9
2 . 450 . 25 . 8
55 . 17 .16 . 15
125 . 98 . 2 . 8 . 25
15 . 6 . 4 . 125 . 8
a: \(=\left(18\cdot25\right)\cdot9\cdot26=234\cdot450=105300\)
b: \(=\left(25\cdot8\cdot2\right)\cdot450=400\cdot450=180000\)
c: \(=\left(55\cdot17\right)\cdot16\cdot15=240\cdot935=224400\)
d: \(=125\cdot8\cdot2\cdot25\cdot98=98\cdot50\cdot1000=4900000\)
e: \(=125\cdot8\cdot15\cdot4\cdot6=1000\cdot360=360000\)
Tính nhanh
18 . 26 . 25 . 9
2 . 450 . 25 . 8
55 . 17 .16 . 15
125 . 98 . 2 . 8 . 25
15 . 6 . 4 . 125 . 8
18 . 26 . 25 . 9
= ( 18 . 25 ) . ( 26 . 9 )
= 450 . 234
= 105 300
2 . 450 . 25 . 8
= ( 2 . 450 ) . ( 25 . 8 )
= 900 . 200
= 180 000
55 . 17 .16 . 15
( 15 . 16 ) . ( 55 . 17 )
= 240 . 935
= 224 400
125 . 98 . 2 . 8 . 25
( 25 .8 ) . ( 125 . 2 ) . 98
= 200 . 250 . 98
= 50 000 . 98
= 4 900 000
15 . 6 . 4 . 125 . 8
= ( 125 . 4 ) . ( 15 . 8 ) . 6
= 500 . 120 . 6
= 60 000 . 6
= 36 000
chúc bạn may mắn . tick cho mình nhé !
Câu 1
a)17-25+55-17
b)25--75)+32-(32+75)
c)(-5).8.(-2).3
d)(-15)+(-122)
e)/-127/-18.(5-6)
ai giải Đc bài này đầy đủ lời giải sẽ đc tặng card 10k
17 - 25 + 55 - 17
= ( 17 - 17 ) + ( 25 + 55 )
= 0 + 80
= 80
( 25 - 75 ) + 32 - ( 32 + 75 )
= 25 - 75 + 32 - 32 - 75
= 25 + ( 75 - 75 ) + ( 32 - 32 )
= 25 + 0 + 0
= 25
3 câu còn lain tự làm