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1=11 2=22 3=33 4=44 5=55 6=66 7=77 8=88 .... 11=1
như đề bài cho
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\(\dfrac{11}{4}\) \(\times\) 49 : \(\dfrac{77}{2}\)
= \(\dfrac{11}{4}\) x 49 x \(\dfrac{2}{77}\)
= \(\dfrac{11\times7\times7\times2}{4\times11\times7}\)
= \(\dfrac{7}{2}\)
\(\dfrac{11}{4}.9:\dfrac{77}{2}\)
\(=\dfrac{11}{4}.9.\dfrac{22}{7}\)
\(=\dfrac{11.7.7.2}{4.11.7}\)
\(=\dfrac{7}{2}\)
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\(\dfrac{11}{4}\times49:\dfrac{77}{2}\)
\(=\dfrac{11}{4}\times\dfrac{49}{1}\times\dfrac{2}{77}\)
\(=\dfrac{11}{4}\times\dfrac{2}{77}\times49\)
\(=\dfrac{1}{2}\times\dfrac{1}{7}\times49\)
\(=\dfrac{1}{14}\times49\)
\(=\dfrac{49}{14}=\dfrac{7}{2}=3,5\)
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X x (\(\dfrac{11}{5}\)+ \(\dfrac{4}{7}\)) = \(\dfrac{5}{77}\)
X x \(\dfrac{97}{35}\)=\(\dfrac{5}{77}\)
X = \(\dfrac{5}{77}:\dfrac{97}{35}\)
X = \(\dfrac{25}{1067}\)
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132 + 77 + 198
= 11 x 12 + 11 x 7 + 18 x 11
= 11 x ( 12 + 7 + 18 )
= 11 x 37
B
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1) 123. 456456-456.123123
= 123. 123123.2 - 123. 123123.2
= 0
2) 127.313313-13.127127
= 127. 313.1001 - 13. 1001.127
= 127127.313 - 13.127127
= 127127. ( 313-13)
=127127.300 = 38138100
3) (98.7676-9898.76).(1+2+3+......+100)
= (98. 101.76 - 98.101.76).(1+2+3+......+100)
= 0 .(1+2+3+........+100)
=0
4) 19 + 19 +......+19+77+77+....+77
= 19x 23 + 77 x19
= 19 x ( 23+77)
= 19 x 100
= 1900
\(\dfrac{2}{11}\) : \(\dfrac{1}{77}\) = \(\dfrac{2}{11}\) \(\times\) 77 = 14
\(14\)