Câu 22 trang 11 Sách Bài Tập (SBT) Toán 7 tập 1

Tính.

Tính:

(M = left[ {left( {{2 over {193}} - {3 over {386}}} ight).{{193} over {17}} + {{33} over {34}}} ight]:left[ {left( {{7 over {2001}} + {{11} over {4002}}} ight).{{2001} over {25}} + {9 over 2}} ight])

Giải

(M = left[ {left( {{2 over {193}} - {3 over {386}}} ight).{{193} over {17}} + {{33} over {34}}} ight]:left[ {left( {{7 over {2001}} + {{11} over {4002}}} ight).{{2001} over {25}} + {9 over 2}} ight]) 

( = left[ {left( {{4 over {386}} - {3 over {386}}} ight).{{193} over {17}} + {{33} over {34}}} ight]:left[ {left( {{{14} over {4002}} + {{11} over {4002}}} ight).{{2001} over {25}} + {9 over 2}} ight])

( = left[ {{1 over {386}}.{{193} over {17}} + {{33} over {34}}} ight]:left[ {{{25} over {4002}}.{{2001} over {25}} + {9 over 2}} ight])

( = left( {{1 over {34}} + {{33} over {34}}} ight):left( {{1 over 2} + {9 over 2}} ight) = 1:5 = {1 over 5})

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