20,10 x 35 -19,45 x 65 +20,10 x 65 -19,45 x 35
Tính bằng cách thuận tiện nhất :
20,10 * 35 - 19,45 * 65 + 20,10 * 65 - 19,45 * 35
= 35*(20,10-19,45)+65*(20,10-19,45)
=35*0,65+65*0,65
=0,65*(35+65)
=0,65*100
=65
19,45 x 101 - 19,45
Biểu thức nào sau đây có giá trị bằng biểu thức (35 + 65) x 527?
A. 35 + 65 x 527
B. 35 + 527 x 65 + 527
C. 35 x 527 + 65 x 527
D. 35 x 527 + 65
Không làm phép tính, so sánh A và B, số nào lớn hơn :
A = 2,008 x 201,2
B = 20,10 x 20,10
de ma vi 201.2 da lớn hon các số khac
A>B
Tick cho mình nha Phạm Nhật Thuỳ Linh
Tính nhanh : 35 x 34 + 35 x 65 + 65 x 75 + 65 x 45
35 x 34 + 35 x 65 + 65 x 75 + 65 x 45
= ( 35 x 34 + 35 x 65 ) + ( 65 x 75 + 65 x 45 )
= 35 x ( 34 + 65 ) + 65 x ( 75 + 45 )
= 35 x 99 + 65 x 120
= 3465 + 7800
= 11265
\(35.34+35.65+65.75+65.45\)
=\(35.\left(34+65\right)+65.\left(75+45\right)\)
= 35. 99 +65.120
=3465 + 7800
= 11265
2,5.x+x.1,5=20,10
tìm x
2,5.x+x.1,5=20,10
=> x.(2,5+1,5)=20,10
=> x.4=20,10
=> x=20,10:4
=> x=5,025
2,5 . x + x . 1,5 = 20,10
x . (2,5 + 1,5) = 20,10
x. 4 = 20,10
x = 20,10 : 4
x = 5,025
Tính bằng cách nhanh nhất
65 x 121 - 35 x 17 + 11 x 65 - 115 x 35
= 65 x ( 121 + 11) - 35 x ( 17 + 115 )
= 65 x 132 - 35 x 132
= ( 65 - 35) x 132
= 30 x 132
= 3960
\(65\cdot121-35\cdot17+11\cdot65-115\cdot35\)
\(=65\cdot\left(11+121\right)-35\cdot\left(115+17\right)\)
\(=65\cdot132+35\cdot132\)
\(=132\cdot\left(65+35\right)\)
\(=132\cdot100\)
\(=13200\)
không tính hãy so sánh 20,08 x 20,10 và 2,009 x 200,9
20,08 x 20,10 = 2,009x 200,9
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35 x 26 + 65 x 59 + 34 x 35 + 51 x 65
35 x 26 + 65 x 59 + 34 x 35 + 51 x 65
= 35 x ( 26 + 34 ) + 65 x ( 51 + 59 )
= 35 x 60 + 65 x 110
= 2100 + 7150
= 9250
35 x 26 + 65 x 59 + 34 x 35 + 51 x 65
= 35 (26 + 34) + 65 (59 + 51)
= 35 x 60 + 65 x 110
= 2100 + 7150
= 9250
\(35x26+65x59+34x35+51x65=8791\)
\(K\)\(nha!!!\)