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M = 1000 :0,5+2,5:0,25+10*0,5
=2000+10+5=2015
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3,75 x 0,25 + 3,75 x 0,5 + 3,75 x 0,25
= 3,75 x (0,25 + 0,5 + 0,25)
= 3,75 x 1
= 3,75
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\(=\frac{1}{2}:\frac{1}{2}-\frac{1}{4}:\frac{1}{4}+\frac{1}{8}:\frac{1}{4}-\frac{1}{10}:\frac{1}{10}\)
\(=\frac{1}{2}\cdot2-\frac{1}{4}\cdot4+\frac{1}{8}\cdot4-\frac{1}{10}\cdot10\)
\(=1-1+\frac{1}{2}-1\)
\(=0+\frac{1}{2}-1=\frac{1}{2}-\frac{2}{2}=\frac{-1}{2}\)
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\(13,25\div0,5+13,25\div0,25+13,25\div0,25\)
\(=13,25\times2+13,25\times4+13,25\times4\)
\(=13,25\left(2+4+4\right)\)
\(=13,25\times10\)
\(=132,5\)
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1,8:0,5+3,6:0,25
=(1,8:0,5)+((3,6x2):(0,25x2))
=(1,8:0,5)+(7,2:0,5)
=(1,8+7,2)x2
=9x2
=18
Vậy tổng trên bằng 18
Đáp số:18
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19,98 : 0,5 + 19,98 : 0,25 + 19,98 x 3 + 19,98
= 19,98 : ( 0,5 + 0,25 ) x 3
= 19,98 : 0,75 x 3
= 26,64 x 3
= 79,92
32,18 : 0,5 + 67,82 x 2 -22,18 : 0,25 -2,82 x4
= 32,18 x 2 + 67,82 x2 - 22,18 x 4 - 2,82 x4
= (32,18 +67,82 ) x 2 - ( 22,18 + 2,82 ) x 4
= 100 x 2 -25 x 4
= 200 - 100 = 100