a)2$\frac{3}{4}$.(-0,4)+1$\frac{3}{5}$.1,75+(-7,2):$\frac{9}{11}$
b)($\frac{1}{24}$-$\frac{5}{16}$):$\frac{-3}{8}$+$1^{10}$.$(-5)^{0}$
a)2$\frac{3}{4}$.(-0,4)+1$\frac{3}{5}$.1,75+(-7,2):$\frac{9}{11}$
b)($\frac{1}{24}$-$\frac{5}{16}$):$\frac{-3}{8}$+$1^{10}$.$(-5)^{0}$
Đáp án:
a)$\frac{-71}{10}$
b)$\frac{31}{18}$
Giải thích các bước giải:
a)2$\frac{3}{4}$.(-0,4)+1$\frac{3}{5}$.1,75+(-7,2):$\frac{9}{11}$
=$\frac{11}{4}$.(-$\frac{2}{5}$)+$\frac{8}{5}$.$\frac{7}{4}$+(-$\frac{36}{5}$):$\frac{9}{11}$
=-$\frac{11}{10}$+$\frac{14}{5}$+$\frac{-44}{5}$
=-$\frac{11}{10}$+$\frac{28}{10}$+$\frac{-88}{10}$
=$\frac{-71}{10}$
b)($\frac{1}{24}$-$\frac{5}{16}$): $\frac{-3}{8}$+ $1^{10}$.(-5)$^{0}$
= ($\frac{1}{24}$-$\frac{5}{16}$): $\frac{-3}{8}$+1.1
=$\frac{-13}{48}$: $\frac{-3}{8}$+ 1.1
=$\frac{13}{18}$+1
=$\frac{31}{18}$
Đáp án + Giải thích các bước giải:
`a)` `2 3 /4*(-0,4)+1 3/5*1,75+(-7,2):9/11` $\\$ `= 11/4*(-2/5)+8/5*7/4+(-36/5):9/11` $\\$ `= -11/10+14/5+(-36/5)*11/9` $\\$ `= -11/10 + 14/5-44/5=-11/10+28/10-88/10=-71/10`
`b)` `(1/24 – 5/16):(-3)/8+1^10*(-5)^0` $\\$ `= (2/48-15/48):(-3)/8+1*1` $\\$ `= (-13/48)*(-8)/3+1= 13/18+1` $\\$ `= 13/18 +18/18 = 31/18`