45 + 24 =
35 + 13 =
75 - 33 =
95 - 45 =
Ai giúp mình câu nà với 35*24+95*86+65*75+65*45
rut gon roi quy dong va phan so
34 phan 5i va 38 phan 95 msc
54 phan 36 va 26 phan 39 msc
42 phan 28 va 27 phan 45 msc
33 phan 25 va 25 phan 75 msc
21 phan 35 va 18 phan 24 msc
33 phan 77 va 25 phan 75
thế nào vậy Lê Trâm Anh?
ko chi thi thoi
tim cach tinh nhanh nhat cho cac cau hoi :
25*25
35*35
45*45
55*55
65*65
75*75
85*85
95*95
15h+45+25+35+65+75+85+95=?
15+45+25+35+65+75+85+95
=15+25+35+45+65+75+85+95
=(15+25+35+45)+(65+75+85+95)
=120 + 320
=440
tick nha Đức Dương
15+25+35+45+55+65+75+85+95=
15 + 25 + 35 + 45 + 55 + 65 + 75 + 85 + 95
= ( 15 + 85 ) + ( 25 + 75 ) + ( 35 + 65 ) + ( 45 + 55 ) + 95
= 100 + 100 + 100 + 100 + 95
= 495
Ngô Quang Ninh:
15 + 25 + 35 + 45 + 55 + 65 + 75 + 85 + 95
= (15 + 85) + (25 + 75) + (35 + 65) + (45 + 55) + 95
= 100 + 100 + 100 + 100 + 95
= 495
Tham khảo nha!
5+15+25+35+45+55+65+75+85+95=?????????
= ( 5 + 95 ) + ( 15 + 85 ) + ( 25 + 75 ) + ( 35 + 65 ) + ( 45 + 55 )
= 100 + 100 + 100 + 100 + 100
= 5 x 100
= 500
Bài 1: Tính hợp lý
a) ( - 68 + 42 ) - ( 5042 - 6068 ) - (-2)0
b) 29 × ( 19 - 37 ) - 19 ×(29-37)
c) (-15) × 24 + 15 × (-75) - 15
d) 1 phần 5 + 4 phần 7 - 11 phần 35
e) ( 13 × 95 - 73 ) - ( 13 × 45 + 27 ) - (-1)2021
a) Ta có: \(\left(-68+42\right)-\left(5042-6068\right)-\left(-2\right)^0\)
\(=-68+42-5042+6068-1\)
\(=6000-5000-1\)
\(=999\)
b) Ta có: \(29\cdot\left(19-37\right)-19\cdot\left(29-37\right)\)
\(=29\cdot19-29\cdot37-29\cdot19+19\cdot37\)
\(=-29\cdot37+19\cdot37\)
\(=37\cdot\left(-29+19\right)\)
\(=37\cdot\left(-10\right)=-370\)
c) Ta có: \(\left(-15\right)\cdot24+15\cdot\left(-75\right)-15\)
\(=\left(-15\right)\cdot24+\left(-15\right)\cdot75+\left(-15\right)\cdot1\)
\(=\left(-15\right)\cdot\left(24+75+1\right)\)
\(=-15\cdot100=-1500\)
d) Ta có: \(\frac{1}{5}+\frac{4}{7}-\frac{11}{35}\)
\(=\frac{5}{35}+\frac{20}{35}-\frac{11}{35}\)
\(=\frac{14}{35}=\frac{2}{5}\)
e) Ta có: \(\left(13\cdot95-73\right)-\left(13\cdot45+27\right)-\left(-1\right)^{2021}\)
\(=13\cdot95-73-13\cdot45-27-\left(-1\right)\)
\(=13\left(95-45\right)-\left(73+27\right)+1\)
\(=13\cdot50-100+1\)
\(=551\)
Bài 1: Tính hợp lý
a) ( - 68 + 42 ) - ( 5042 - 6068 ) - (-2)\(^0\)
= -26 - (-1026) - 1
= - 26 + 1026 - 1
= 1000 - 1
= 999
Mấy câu còn lại c hơi làm biếng, sr :<<
a ) 25 - ( - 75 ) + 32 - ( 32 + 75 )
b ) 24 . ( 16 - 5 ) - 16 . ( 24 - 15 )
c ) 29 . ( 19 - 13 ) - 19 - ( 29 - 13 )
d ) ( 55 + 45 15 ) - ( 15 - 55 + 45 )
a ) 25 - ( - 75 ) + 32 - ( 32 + 75
= 25 + 75 + 32 - 32 - 75
= 100 + 0 - 75
= 25
b ) 24 . ( 16 - 5 ) - 16 . ( 24 - 15 )
= 24 . 11 - 16 . 9
= 264 - 144
= 120
c ) 29 . ( 19 - 13 ) - 19 - ( 29 - 13 )
29 . 6 - 19 - 29 + 13
= 174 - 19 - 29 + 13
= 126 + 13
= 139
d ) ( 55 + 45 15 ) - ( 15 - 55 + 45 )
= 4570 - 15 + 10
= 4555 + 10
= 4565
1) (35-15).(-4)+24.(-13-17)
2)(-13).(57-32)+57.(13-45)
3)(-8).(-12).(-125)
4)(-134)+51.134+(-134).48
5) 45.(-24)+(-10).(-12)
1: =20*(-4)+24(-30)
=-80-720=-800
2: =-13*57+13*32+57*13-57*45
=13*32-57*45=-2149
3: =-12*8*125
=-12*1000=-12000
4: =(-134)(1-51+48)
=(-134)*(-2)=268
5: =(-24)(45-5)=40*(-24)=-960