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a) \(\frac{58}{19}+\frac{13}{17}+\frac{35}{43}+\frac{119}{19}+\frac{8}{43}\)
\(=\frac{13}{17}+\left(\frac{58}{19}+\frac{119}{19}\right)+\left(\frac{35}{43}+\frac{8}{43}\right)\)
\(=\frac{13}{17}+\frac{204}{19}+1\)
\(=\frac{1808}{133}\)
b) \(\frac{-5}{7}.\frac{2}{11}+\frac{-5}{7}.\frac{9}{11}+\frac{13}{4}\)
\(=\frac{-5}{7}.\left(\frac{2}{11}+\frac{9}{11}\right)+\frac{13}{4}\)
\(=\frac{-5}{7}.1+\frac{13}{4}\)
\(=\frac{71}{28}\)
c) \(\frac{146}{13}-\left(\frac{21}{7}+\frac{68}{13}\right)\)
\(=\left(\frac{164}{13}-\frac{68}{13}\right)+3\)
\(=\frac{135}{13}\)
d) \(\frac{2}{7}.\frac{21}{4}-\frac{2}{7}.\frac{13}{4}\)
\(=\frac{2}{7}.\left(\frac{21}{4}-\frac{13}{4}\right)\)
\(=\frac{2}{7}.\frac{8}{4}\)
\(=\frac{4}{7}\)
P/s: Mk ko chắc nữa!
3) 5.(x-15)-75=0
5.(x-15)=75
x-15=15
x=15+15
x=30
8) 315+(146-x)=491
146-x=491-315
146-x=176
x=146-176
x=-30
6) 6.x-5=600+13
6.x-5=613
6.x=613+5
6.x=618
x=618:6
x=103
11)(x-17):8+52=158
(x-17):8=158-52
(x-17):8=106
x-17=106.8
x-17=848
x=848+17
x=865
7) (x-47).5-115=0
(x-47).5=115
x-47=115:5
x-47=23
x=23+47
x=70
10) 135-5.(x+37)=80
5.(x+37)=135-80
5(x+37)=55
x+37=55:5
x+37=11
x=11-37
x=26
13) 320:y-10=5.48:24
320:y-10=240:24
320:y-10=10
320:y=10+10
320:y=20
y=320:20
y=16
-3/11.(-22)/66.121/15
=(-3).(-22).121
11.66.15
=11
15
3/7.2/5.7/3.20.19/72
=3.2.7.20.19
7.5.3.72
=76
16
6/7.8/13+6/13.9/7-3/13.6/7
=6/7.8/13+6/7.9/13-3/13.6/7
=6/7.(8/13+9/13-3/13)
=6/7.14/13
=12/13
-1/4.152/11+68/4.(-1)/11
=152/4.(-1)/11+68/4.(-1)/11
=(-1)/11.(152/4+68/4)
=(-1)/11.220/4
=-110/22
-5/7.2/11+(-5)/7.9/11+12/7
=-5/7.2/11+-5/7.9/11+12/7
=-5/7.(2/11+9/11)+12/7
=-5/7.1+12/7
=(-5)/7+12/7
=7/7
=1
146/13-(18/7+68/13)
=146/13-18/7-68/13
=(146/13-68/13)-18/7
=78/13-18/7
=6-18/7
=42/7-18/7
=24/7
có ai không giúp mình giải với
thời gian của mình chỉ còn hôm nay nữa thôi
(x : 8 + 13 ) . 4 = 146 + 290 : 5
( x : 8 + 13 ) . 4 = 146 + 58
( x : 8 + 13 ) . 4 = 204
x : 8 + 13 = 204 : 4
x : 8 + 13 = 51
x : 8 = 51 - 13
x : 8 = 38
x = 38 x 8
x = 304
(x : 8 + 13) . 4 = 146 + 290 : 5
(x : 8 + 13) . 4 = 146 + 58
(x : 8 + 13) . 4 = 204
x : 8 + 13 = 51
x : 8 = 38
x = 304