224 - 0,5 x 40 x 5 x 0.2 x 20 x 0.25

=    224 - ( 0.5 x 20 ) x ( 40 x 0.25 ) x ( 5 x 0.2 )

=    224 -   10 x 10 x 1

=    224 - 100

=    124

44700 k cho minh nha

\(\frac{25\times4-0,5\times40\times5\times0,2\times20\times0,25}{1+2+4+8+...+128+256}\)

\(=\frac{100-\left(20\times5\right)\times\left(0,5\times0,2\times0,25\times40\right)}{1+2+4+8+...+128+256}\)

\(=\frac{100-100\times\left(\frac{1}{40}\times40\right)}{1+2+4+8+...+128+256}\)

\(=\frac{100\times\left(1-1\right)}{1+2+4+8+...+128+256}\)

\(=0\)

\(\frac{25\times4-0,5\times40\times5\times0,2\times20\times0,25}{1+2+4+8+...128+256}\)

\(=\frac{100-\left(0,5\times20\right)\times\left(40\times0,25\right)\times\left(5\times0,2\right)}{1+2+4+8+...+128+256}\)

\(=\frac{100-10\times10\times1}{1+2+4+8+...+128+256}\)

\(=\frac{100-100}{1+2+4+8+...+128+256}\)

\(=\frac{0}{1+2+4+8+...+128+256}=0\)

Đặt \(A=25\times4-0,5\times40\times5\times0,2\times20\times0,25\)

\(\Leftrightarrow A=100-\left(0,5\times0,2\right)\times\left(40\times0,25\right)\times\left(5\times20\right)\)

\(\Leftrightarrow A=100-0,1\times10\times100\)

\(\Leftrightarrow A=100-100=0\)

Vậy theo đề bài, ta có :

\(\frac{25\times4-0,5\times40\times5\times0,2\times20\times0,25}{1+2+8+...+128+256}=\frac{0}{1+2+8+...+128+256}=0\)

Vậy ..................

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120 - 0,5 x 40 x 5 x 0,2 x 20 x 0,25 - 20

= ( 120 - 20 ) - [ ( 0,5 x 20 ) x ( 40 x 0,25 ) x ( 0,2 x 5 ) ]

=       100      - [      10        x       10         x     1         ]

=       100      -              100

= 0

\(120-0,5\times40\times5\times0,2\times20\times0,25-20\)

\(=120-\left(0,5\times20\right)\times\left(40\times0,25\right)\times\left(5\times20\right)-20\)

\(=120-10\times10\times100-20\)

\(=120-10000-20\)

\(=-9900\)

\(27\cdot25\cdot\left(3+1\right)-230=27\cdot25\cdot4-230\)

có thể trình bày rõ ràng ra ko

a)\(A=\left\{\left(0,1+0,9\right)+\left(0,2+0,8\right)+\left(0,3+0,7\right)+\left(0,4+0,6\right)+0,5\right\}\)

\(A=4.\left(1\right)+0,5=4,5\)

\(B=\left\{\left(1,01+1,09\right)+...\left(1,04+1,06\right)+1,05\right\}+1,1\)

\(B=4.\left(2,1\right)+1,05+1,1=8,4++1,05+1,1=10,46\)

A+B=4,5+10,46=14,96

a)4,5

b)14,96

ai tk mk

mk tk lại

mk hứa

yên tâm

thank nhiều

140 - 0,5 x 40 x 5 x 0,2 x 20 x 0,25 - 40

= (140 - 40 ) - (0,5x20) x (40 x 0,25)

= 100 - 100

= 0 

140 - 0,5 x 40 x 5 x 0,2 x 20 x 0,25 - 40

= (140 - 40 ) - (0,5x20) x (40 x 0,25)

= 100 - 100

= 0