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2:
a: =4+3/8+5+2/3
=9+3/8+2/3
=216/24+9/24+16/24
=216/24+25/24
=241/24
b; =2+3/8+1+1/4+3+6/7
=6+3/8+1/4+6/7
=6+5/8+6/7
=419/56
c: \(=2+\dfrac{3}{8}-1-\dfrac{1}{4}+5+\dfrac{1}{3}\)
=6+3/8-1/4+1/3
=6+1/8+1/3
=6+11/24
=155/24
d: \(=3+\dfrac{5}{6}+6\cdot\dfrac{13}{6}\)
=3+13+5/6
=16+5/6
=101/6
e: =3+1/2+4+5/7-5-5/14
=3+4-5+1/2+5/7-5/14
=2+7/14+10/14-5/14
=2+12/14
=2+6/7=20/7
f: =9/2+1/2:11/2
=9/2+1/11
=99/22+2/22=101/22
a,\(\left(3x-4\right)\left(x-1\right)^3=0\)
\(=>\orbr{\begin{cases}3x-4=0\\x-1=0\end{cases}}\)
\(=>\orbr{\begin{cases}x=\frac{4}{3}\\x=1\end{cases}}\)
b,\(\left(x+1\right)+\left(x+2\right)+...+\left(x+100\right)=7450\)
\(=>x.100+\left(1+2+3+...+100\right)=7450\)
\(=>100x+5050=7450\)
\(=>100x=2400\)
\(=>x=24\)
a, \(x-\frac{5}{6}=\frac{-2}{3}\)
\(\Leftrightarrow x=\frac{1}{6}\)
b, \(\frac{-7}{5}+x=\frac{-4}{3}\)
\(\Leftrightarrow x=\frac{1}{15}\)
c, \(x-\frac{2}{5}=-\frac{1}{6}-\frac{3}{-4}\)
\(\Leftrightarrow x-\frac{2}{5}=-\frac{1}{6}+\frac{3}{4}\)
\(\Leftrightarrow x-\frac{2}{5}=\frac{7}{12}\Leftrightarrow x=\frac{59}{60}\)
a) 295 - (31 - 22 x 5)2
= 295 - (31 - 4 x 5)2
= 295 - (31 - 20)2
= 295 - 112
= 295 - 121
= 174
b) 79 : 77 - 32 + 23 x 52
= 72 - 9 - 8 x 25
= 49 - 9 - 8 x 25
= 40 - 200
= -160
c) 1200 : 2 + 62 x 21 + 18
= 600 + 36 x 2 + 18
= 600 + 72 + 18
= 600 + 90
= 690
d) 151 - 291 : 288 + 12 x 3
= 151 - 23 + 1 x 3
= 151 - 8 + 1 x 3
= 151 - 8 + 3
= 151 - 11
= 140
e) 238 : 236 + 51 : 32 - 72
= 22 + 5 : 9 - 49
= 4 + 5 : 9 - 49
= 9 : 9 - 49
= 1 - 49
= -48
Học tốt!!!
rút gọn
9/30 = 3/10; 98/80 = 49/40; 15/1000 = 3/200
Quy đồng
3/10 = 60/200; 49/40 = 2450/200 ; 3/200
C = (-16).125.[(-3).22.53 - 2.106
C = 24.53.3.22.53 - 2.106
C = 26.56.3 - 2.106
C = 3.106 - 2.106
C = 106
C = 1 000 000
1) x - 2 = -6
x = - 6 + 2
x = -4
2) -5x-(-3)=13
-5x+3=13
-5x=13-3=10
x=10:(-5)
x=-2
3) 15-(x-7)=21
15-x+7=21
15-x=21-7=14
x=15-14=1
4) 3x+17=2
3x=2-17=-15
x=-15:3=-5
5) 45-(x-9)=-35
45-x+9=-35
45-x=-35-9=-44
x=45-(-44)=89
6) -5+x=15
x=15-(-5)
x=20
7) 2x-(-17)=15
2x+17=15
2x=15-17=-2
x=-2:2=-1