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45 . 25 . 32 . 1,25
= 45 . 25 . (32 . 1,25)
= 45 . 25 . 40
= 45 . (25 . 40)
= 45 . 1000
=45000
45 x 25 x 32 x 1,25 = 45 x 25 x 4 x 8 x 1, 25 = 45 x 100 x 8 x 1,25 = 45 x 8 x 1, 25 x 100 = 45 x 8 x 125 = 45 x 1000 = 45000
a. 64 x 25 + 35 x 25 + 25
= 64 x 25 + 35 x 25 + 25 x 1
= 25 x ( 64 + 35 + 1 )
= 25 x 100
= 2500
b. 58 x 42 + 32 x 8 + 5 x 16
c. ( 42 x 43 + 57 x 43 + 43 ) - 360 : 4
= 42 x 43 + 57 x 43 + 43 x 1 - 90
= 43 x ( 42 + 57 +1 ) - 90
= 43 x 100 - 90
= 4300 - 90
= 4210
d. 456 : 2 x 181456 : 3 - 102
Trả lời:
a,\(64\times25+35\times25+25\)
\(=25\times\left(64+35+1\right)\)
\(=25\times100\)
\(=2500\)
b,\(58\times42+32\times8+5\times16\)
\(=2436+256+80\)
\(=2772\)
c,\(\left(42\times43+57\times43+43\right)-360\div4\)
\(=43\times\left(42+57+1\right)-90\)
\(=43\times100-90\)
\(=4300-90\)
\(=4210\)
d,\(456\div2\times181456\div3-102\)
\(=228\div3\times181456-102\)
\(=76\times181456-102\)
\(=13790656-102\)
\(=13790554\)
a: \(=\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{18}{21}+\dfrac{3}{21}\right)+\dfrac{19}{32}+\dfrac{13}{32}=1+1+1=3\)
b: \(=35\cdot1.1\cdot25\cdot\left(7,5-7,5\right)=0\)
32 x 1,25 x 25 x (54/10 x 8,7 + 5,4 x 3,3 - 10,8)
= (32 x 25) x 1,25 x (5,4 x 8,7 + 5,4 x 3,3 - 10,8)
= 800 x 1,25 x (5,4 x 8,7 + 5,4 x 3,3 - 5,4 x 2)
= 1000 x [ 5,4 x (8,7 + 3,3 - 2) ]
= 1000 x (5,4 x 10)
= 1000 x 54
= 54000
k mik nha bn
a) 81 + 243 + 19 = (81 + 19) + 243
= 100 + 143 = 243
b) 168 + 79 + 132 = (168 + 132) + 79
= 300 + 79 = 379
c) 5 x 25 x 2 x 16 x 4 = (5 x 2) x (25 x 4) x 16
= 10 x 100 x 16 = 16000
d) 32 x 47 + 32 x 53 = 32 x (47 + 53)
= 32 x 100 = 3200
e) 26 + 27 + 28 + 29 + 30 + 31 + 32 = (26 + 32) + (27 + 31) + (28 + 30) + 29
= 58 + 58 + 58 + 29
= 58 x 3 + 29 = 174 + 29 = 203
mình trả lời ý a
64 x 25 +35 x 25 +25 x 1
= 25 x ( 64 + 35 + 1 )
= 25 x 100
= 2500
\(\frac{x}{100}+0,99x=0,5\Rightarrow\frac{1}{100}x+\frac{99}{100}x=0,5\Rightarrow x=0,5\)
x : 100 + 0.99 . x = 0.5
x . \(\frac{1}{100}\) + 0.99 . x = 0.5
x . 0.01 + 0.99 . x = 0.5
x . ( 0.01 + 0.99 ) = 0.5
x . 1 = 0.5
x = 0.5 : 1
x = 0.5
32 x 0,99 x 25 x1,25
= 4x8x0,99x25x1,25
= (4x25)x(1,25x8)x0,99
=100x10x0,99
=1000x0,99
=990