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a, 20,18 x 7,5 + 20,18 + 20,18 + 20,18 : 2
= 20,18 x 7,5 + 20,18 x 1 + 20,18 x 1 + 20,18 x 0,5
= 20,18 x ( 7,5 + 1 + 1 + 0,5)
= 20,18 x 10
= 201,8
b, 100 : 9 - 79,3 : 9
= (100 - 79,3) : 9
= 20,7 : 9
= 2,3
35,5 : 0,125 + 35,5 x 2
= 35,5 x 8 + 35,5 x 2
= 35,5 x (8+2)
= 35,5 x 10
= 355
25,5 : 0,5 + 25,5 x 8
= 25,5 x 2 + 25,5 x 8
= 25,5 x (2+8)
= 25,5 x 10
= 255
Lời giải:
$20,18\times 8,5+20,18+20,18:2$
$=20,18\times 8,5+20,18\times 1+20,18\times 0,5$
$=20,18\times (8,5+1+0,5)=20,18\times 10=201,8$
\(25,5+25,5+25,5\div8+25,5\)
\(=25,5+25,5+22,5.\frac{1}{8}+25,5\)
\(=25,5\left(1+1+\frac{1}{8}+1\right)\)
\(=25,5\left(\frac{24}{8}+\frac{1}{8}\right)\)
\(=25,5.\frac{25}{8}\)
\(=79,6875\)
\(25,5+25,5:8+25,5=25,5\cdot\left(1+\frac{1}{8}+1\right)=\frac{51}{2}\cdot\frac{17}{8}=\frac{867}{16}\)
a) 25,5 : 0,2 + 25,5 : 0,125 - 25,5 x 2 - 25,5
= 25,5 x 5 + 25,5 x 8 - 25,5 x 2 - 25,5 x 1
= 25,5 x (5 + 8 - 2 - 1)
= 25,5 x 10
= 255
b) 20,18 x 7,5 + 20,18 x 2 + 20,18 : 2
= 20,18 x 7,5 + 20,18 x 2 + 20,18 x 0,5
= 20,18 x (7,5 + 2 + 0,5)
= 20,18 x 10
= 201,8
a) \(25,5:0,2+25,5:0,125-25,5\times2-25,5\)
\(=25,5\times5+25,5\times8-25,5\times2-25,5\)
\(=25,5\times\left(5+8-2-1\right)\)
\(=25,5\times10=255\)
b) \(20,18\times7,5+20,18\times2+20,18:2\)
\(=20,18\times7,5+20,18\times2+20,18\times0,5\)
\(=20,18\times\left(7,5+2+0,5\right)\)
\(=20,18\times10=201,8\)
\(#Nulc`\)