Tính nhanh
-15/29 . 7/8 - 15/29 . 3/8 + 15/29 : 4/3
Những câu hỏi liên quan
tính nhanh neu co the
a)(-1/6+5/12)+7/12
b)-15/-172+15/172+12/48+3/4
c)11/7+-3/8+2/7+1/3+1/7+5/-8
d)4/-19+7/29+-15/19+1+22/29
a ) ( -1/6 + 5/12 ) + 7/12
= -1/6 + ( 5/12 + 7/12 )
= -1/6 + 12/12
= -2/12 + 12/12
= -10/12
= -5/6
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7) -29.(85-47)-85.(47-29)
8) -15.(23-29)+23-(15-29)
9) -13.(55-29)+23.(15-29)
13)-10.(2+4)-5.(4-3)
-29.(85-47)-85.(47-29)
=-29.38-85.18
=-1102-1503
=-2605
-15.(23-29)+23-(15-29)
=-15.(-6)+23-(-14)
=90+23+14
=113+14
=127
-13.(55-29)+23.(15-29)
=-13.26+23.(-14)
=-338+(-322)
=-660
-10.(2+4)-5.(4-3)
=-10.6-5.1
=-60-5
=-65
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(4 5/58 - 3 1/2 + 8 15/29)-(3 5/58 - 7 14/29)
\(=4+\dfrac{5}{58}-3-\dfrac{1}{2}+8+\dfrac{15}{29}-3-\dfrac{5}{58}+7+\dfrac{14}{29}=13+\dfrac{1}{2}=\dfrac{27}{2}\)
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BT2: Tính nhanh:
3) \(\dfrac{-41}{32}\left(\dfrac{15}{8}-\dfrac{16}{41}\right)+\dfrac{15}{8}\left(\dfrac{41}{32}-\dfrac{8}{3}\right)\)
4) \(\dfrac{13}{29}\left(\dfrac{29}{5}-\dfrac{45}{8}\right)-\dfrac{45}{8}\left(\dfrac{9}{8}-\dfrac{13}{29}\right)\)
3)\(\dfrac{-41}{32}\left(\dfrac{15}{8}-\dfrac{16}{41}\right)+\dfrac{15}{8}\left(\dfrac{41}{32}-\dfrac{8}{3}\right)\)
=\(\dfrac{-41}{32}.\dfrac{15}{8}-\dfrac{-41}{32}.\dfrac{16}{41}+\dfrac{15}{8}.\dfrac{41}{32}-\dfrac{15}{8}.\dfrac{8}{3}\)
=\(\left(\dfrac{-41}{32}.\dfrac{15}{8}+\dfrac{15}{8}.\dfrac{41}{32}\right)+\dfrac{-16}{41}.\dfrac{-41}{32}-\dfrac{15}{8}.\dfrac{8}{3}\)
=\(0+\dfrac{1}{2}-5=\dfrac{-9}{2}\)
4)\(\dfrac{13}{29}\left(\dfrac{29}{5}-\dfrac{45}{8}\right)-\dfrac{45}{8}\left(\dfrac{9}{8}-\dfrac{13}{29}\right)\)
=\(\dfrac{13}{29}.\dfrac{29}{5}-\dfrac{45}{8}.\dfrac{13}{29}-\dfrac{45}{8}.\dfrac{9}{8}-\dfrac{45}{8}.\dfrac{13}{29}\)
=\(\left(\dfrac{45}{8}.\dfrac{13}{29}-\dfrac{45}{8}.\dfrac{13}{29}\right)-\dfrac{13}{29}.\dfrac{29}{5}-\dfrac{45}{8}.\dfrac{9}{8}\)
=\(0-\dfrac{13}{5}-\dfrac{405}{64}=\dfrac{-2857}{320}\)
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BT2: Tính nhanh
7) \(-1\dfrac{5}{7}.15+\dfrac{2}{7}.\left(-15\right)+\left(-105\right).\left(\dfrac{2}{3}-\dfrac{4}{5}+\dfrac{1}{7}\right)\)
8) \(\dfrac{13}{29}\left(\dfrac{29}{5}-\dfrac{45}{8}\right)-\dfrac{45}{8}\left(\dfrac{9}{8}-\dfrac{13}{29}\right)\)
Các bạn giúp mk nhé! Thank!
7: \(=\dfrac{-12}{7}\cdot15+\dfrac{2}{7}\cdot\left(-15\right)+\left(-105\right)\cdot\dfrac{70-84+15}{105}\)
\(=\dfrac{-12\cdot15+2\cdot\left(-15\right)}{7}-1\)
\(=\dfrac{-15\cdot14}{7}-1=-15\cdot2-1=-31\)
8: \(=\dfrac{13}{29}\cdot\dfrac{29}{5}-\dfrac{13}{29}\cdot\dfrac{45}{8}-\dfrac{45}{8}\cdot\dfrac{9}{8}+\dfrac{45}{8}\cdot\dfrac{13}{29}\)
\(=-\dfrac{1193}{320}\)
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Tính Nhanh
a) -7,73.3 và1/3 +1,87.-10/3+(-3,6):(-0,3)
b) 8 và 3/29 .-15/9+(-5 và18/29).1 và2/3-8/29:0,6
c) (-21/49+1,43).1 và1/3+(-2 và4/7+6,57):0,75
d) (-9,91+1 và 7/9).6/5-(0,09+10 và 7/9).1,2
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( 4 5/37 - 3 4/5 + 8 15/29 ) - ( 3 5/27 - 6 14/29 )
Câu 7 : Thực hiện phép tính
a) 5/4 + 21/49 - 1/2
b) (15 29/49 - 2 7/8 ) - ( 2 29/31 - 3 )
a.\(\frac{5}{4}+\frac{3}{7}-\frac{1}{2}=\frac{35+12-14}{28}\)\(=\frac{33}{28}\)
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1)tìm x
a)(x-7/18).18/29=-12/29
2)tính nhanh
a)0,25.2và1/3.30,05/8/45
b)(-3,3).-15/64+(0.8- "2và4/15");1và23/24
c)1 và 13/15.3.(0,5)2.3+(8/15-1và19/60):1và24/24
Bài 1:
a: =>x-7/18=-12/29:18/29=-3/2
=>x=-3/2+7/18=7/18-27/18=-20/18=-10/9
Bài 2:
a: \(=\dfrac{1}{4}\cdot\dfrac{7}{3}\cdot30.05\cdot\dfrac{45}{8}=\dfrac{12621}{128}\)
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