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4,7 x 5,5 - 4,7 x 4,5
= 4,7 x ( 5,5 + 4,5 )
= 4,7 x 10
= 47
\(\left(x+0.3\right)+\left(x+0.7\right)+......+\left(x+4.7\right)+\left(x+5.1\right)=48.1\)
\(x+0.3+x+0.7+......+x+4.7+x+5.1=48.1\)
\(\left(x+x+......+x\right)+\left(0.3+0.7+......+5.1\right)=48.1\)( 13 số x )
\(13x+35.1=48.1\)
\(13x=48.1-35.1=13\)
\(x=13:13=1\)
( x + 0.3 ) + ( x + 0.7 ) + ... + ( x + 5.1 ) = 48.1
( x + x + ... + x ) + ( 0.3 + 0.7 + .... + 5.1 ) = 48.1 ( có 13 số x )
13x + 35.1 = 48.1
13x = 13
x = 13 : 13 = 1
= 920
Mình có gửi lờ mời kết bạn nhớ chấp nhận nha !
\(\left(\dfrac{3}{2.5}+\dfrac{3}{5.8}+...+\dfrac{3}{17.20}\right).x=\dfrac{45}{23}\)
\(\left(\dfrac{1}{2}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{8}+....+\dfrac{1}{17}-\dfrac{1}{20}\right).x=\dfrac{45}{23}\)
\(\left(\dfrac{1}{2}-\dfrac{1}{20}\right).x=\dfrac{45}{23}\)
\(\dfrac{9}{20}\cdot x=\dfrac{45}{23}\)
\(x=\dfrac{45}{23}:\dfrac{9}{20}\)
\(x=\dfrac{100}{23}\)
\(\left(\dfrac{3}{2.5}+\dfrac{3}{5.8}+...+\dfrac{1}{17.20}\right)x=\dfrac{45}{23}\Leftrightarrow\left(\dfrac{1}{2}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{8}+...+\dfrac{1}{17}-\dfrac{1}{20}\right)x=\dfrac{45}{23}\)\(\Leftrightarrow\left(\dfrac{1}{2}-\dfrac{1}{20}\right)x=\dfrac{45}{23}\)
\(\Rightarrow\dfrac{9}{20}.x=\dfrac{45}{23}\)
\(\Rightarrow x=\dfrac{100}{23}\)
23,24 × 5,8 - 23,24 × 4,7 - 15,24 - 8
= 23,24 × 5,8 - 23,24 × 4,7 - 23,24
= 23,24 × 5,8 - 23,24 × 4,7 - 23,24 × 1
= 23,24 × (5,8 - 4,7 - 1)
= 23,24 × 0,1
= 2,324
=23,24><(5,8-4,7)-15,24 -8
=23,24><1,1 -15,24 -8
=25,564 -15,24 -8
=10,324 - 8
=2,324