4.5/7
22/23.9/11
-9/7.7/15
Những câu hỏi liên quan
tính bằng cách thuận tiện 12.3 x 4.5 + 4.5 x 7.7
12.3 x 4,5 + 4,5 x 7,7
=4,5 x (12,3 + 7,7 )
=4,5 x 20
=90
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12,3 x 4,5 + 4,5 x 77
= (12,3 + 77) x 4,5
= 20 x 4,5
= 90
:))
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12.3 x 4,5 + 4,5 x 7,7
=4,5 x (12,3 + 7,7 )
=4,5 x 20
=90
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Xem thêm câu trả lời
Câu 1:
a,9+3.(-5) b,-2/15-4/25 c, -3/5.4/11+-3/7.7/11+-3/7
9+3.(-5)=9+(-15)= -6
\(\frac{-2}{15}\)-\(\frac{4}{25}\)= \(\frac{-10}{75}\)-\(\frac{12}{75}\)= \(\frac{-22}{75}\)
\(\frac{-3}{5}\). \(\frac{4}{11}\)+\(\frac{-3}{7}\). \(\frac{7}{11}\)+ \(\frac{-3}{7}\)= \(\frac{-12}{55}\)+ \(\frac{-21}{77}\)+ \(\frac{-3}{7}\)
= \(\frac{-84}{385}\)+\(\frac{-105}{385}\)+\(\frac{-165}{385}\)
= \(\frac{-354}{385}\)
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a) 9+3.(-5) =9-15=-6
b) \(\frac{-2}{15}-\frac{4}{25}=\frac{-2.5}{75}-\frac{4.3}{75}=\frac{-10-12}{75}=\frac{-22}{75}\)
c) \(\frac{-3}{5}.\frac{4}{11}+\frac{-3}{7}.\frac{7}{11}+\frac{-3}{7}=\frac{-12}{55}+\frac{-21}{77}+\frac{-3}{7}=\frac{-12.7}{385}+\frac{-21.5}{385}+\frac{-21.55}{385}=\frac{-84-105-1155}{385}=\frac{-1344}{385}=\frac{-192}{5}\)
hi! hi! hk bit dug hk :)
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1) 80 - ( 4.52 - 3.23 )2) 23.75 + 23.25 + 1803) ( 71997 - 71995) : (7.71994)4) -37 +54 + (-70) + (-163) +2465) 217 + [ 43 + (-127) + (-23)]6) 2448 : [119 - (23 - 6)]7) 397 . 143 + 397 .856 +3978) (28 + 27 + 26 + 25) : (32 . 15)9) (-359) + 181 +(-123) +350 + (-172)10) (-1) + (-2) + (-3) + (-4) + (-5) + (-6) + (-7) + (-8) + (-9) + (-10) + (-11) + (-12) + (-13) + (-14) + (-15) + (-16) + (-17) + (-18) + (-19)
Đọc tiếp
1) 80 - ( 4.52 - 3.23 )
2) 23.75 + 23.25 + 180
3) ( 71997 - 71995) : (7.71994)
4) -37 +54 + (-70) + (-163) +246
5) 217 + [ 43 + (-127) + (-23)]
6) 2448 : [119 - (23 - 6)]
7) 397 . 143 + 397 .856 +397
8) (28 + 27 + 26 + 25) : (32 . 15)
9) (-359) + 181 +(-123) +350 + (-172)
10) (-1) + (-2) + (-3) + (-4) + (-5) + (-6) + (-7) + (-8) + (-9) + (-10) + (-11) + (-12) + (-13) + (-14) + (-15) + (-16) + (-17) + (-18) + (-19)
Tính M= 7/3.4-9/4.5+11/5.6-13/6.7+15/7.8-17/8.9+19/9.10
Tính nhanh:
7/3.4 – 9/4.5 + 11/5.6 – 13/6.7 + 15/7.8 – 17/8.9 + 19/9.10
7 / 3.4 - 9/4.5 - 11/5.6 - 13/6.7 + 15/7.8 - 17/8.9 +19/9.10
giúp mình với
a) A=1/3.4-1/4.5-1/5.6-...-1/9.10
b)B=7/3.4-9/4.5+11/5.6-13/6.7+15/7.8-17/8.9
Ai làm được mình cho 1 like :))
7 / 3.4 - 9/4.5 - 11/5.6 - 13/6.7 + 15/7.8 - 17/8.9 +19/9.10
Yêu cầu tính
7/3.4 - 9/4.5 + 11/5.6 - 13/6.7 + 15/7.8 - 17/8.9 + 19/9.10
= 3+4/3.4 - 4+5/4.5 + 5+6/5.6 - 6+7/6.7 + 7+8/7.8 - 8+9/8.9 + 9+10/9.10
=1/3 + 1/4 - 1/4 - 1/5 + 1/5 + 1/6 -1/6 - 1/7 +1/7 +1/8 - 1/8 - 1/9 + 1/9 + 1/10
=1/3 + 1/10=13/30
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\(=\frac{6+1}{12}-\frac{10-1}{20}+\frac{10+1}{30}-\frac{14-1}{42}+\frac{14+1}{56}-\frac{18-1}{72}+\frac{18+1}{90}\)
=\(\frac{6}{12}+\frac{1}{12}-\frac{10}{20}+\frac{1}{20}+\frac{10}{30}+\frac{1}{30}-\frac{14}{42}+\frac{1}{42}+\frac{14}{56}+\frac{1}{56}-\frac{18}{72}+\frac{1}{72}+\frac{18}{90}+\frac{1}{90}\)
=\(\frac{1}{2}+\frac{1}{12}-\frac{1}{2}+\frac{1}{20}+\frac{1}{3}+\frac{1}{30}-\frac{1}{3}+\frac{1}{42}+\frac{1}{4}+\frac{1}{56}-\frac{1}{4}+\frac{1}{72}+\frac{1}{5}+\frac{1}{90}\)
\(=\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90}+\frac{1}{5}\)
\(=\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}+\frac{1}{6}\)
\(=\frac{1}{3}-\frac{1}{10}+\frac{1}{5}\)
\(=\frac{10}{30}-\frac{3}{30}+\frac{6}{30}=\frac{13}{30}\)
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Giúp mình câu này với: 7/3.4- 9/4.5+ 11/5.6- 13/6.7+ 15/7.8- 17/8.9+ 19/9.10= ?