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c) Ta có: \(\dfrac{3}{5}+\dfrac{-5}{20}+\dfrac{30}{75}+\dfrac{-7}{4}\)
\(=\dfrac{3}{5}+\dfrac{2}{5}+\dfrac{-1}{4}+\dfrac{-7}{4}\)
\(=1-2=-1\)
Giải:
a)-1/12+4/3=-1/12+16/12=15/12=5/4
b)(-4/14-3/15)-(1/5-20/35-(-1)).7
=-17/35-22/35.7
=-17/35-22/5
=-171/35
c)3/5+-5/20+30/75+-7/4
=3/5+-1/4+2/5+-7/4
=(3/5+2/5)+(-1/4+-7/4)
=1+-2
=-1
d)5/6.-12/14+7/13
=-5/7+7/13
=-16/91
e)2/-9-5/-36-1/4
=-1/12-1/4
=-1/3
f)2/23+-5/12+7/18+21/23+-7/12
=(2/23+21/23)+(-5/12+-7/12)+7/18
=1+-1+7/18
=7/18
b1 -10/14
b2 -4/5
b3
a 2/9-7/8.x=1/3
7/8.x=2/9-1/3=-1/9
x=-1/9:-7/8=8/63
b 23/7.x-1/8=11/4
23/7.x=11/4+1/8=23/8
x=23/8:23/7=7/8
b4
Quyển truyện cs số trang:
36:(1−1/4−9/20)=120(trang)
1,
a,-3/5
b,-1/2
c,19/39
d,1/4
e,-39/40
f,-59/56
2,
a,=
b,<
c,>
d,<
k cho mình nha
a) 2/9 - (1/20 + 2/9)
= 2/9 - 1/20 - 2/9
= (2/9 - 2/9) - 1/20
= 0 - 1/20
= -1/20
b) -3/14 + 2/13 + (-25/14) + (-15/13)
= (-3/14 - 25/14) + (2/13 - 15/13)
= -2 - 1
= -3
c) -3/11 + 11/8 - 3/8 + (-8/11)
= (-3/11 - 8/11) + (11/8 - 3/8)
= -1 + 1
= 0
d) 3/8 + (-1/4) - (7/12 - 1/6)
= 1/8 - 5/12
= -7/24
e) (1/3 + 12/67 + 13/41) - (79/67 - 28/41)
= 1/3 + 12/67 + 13/41 - 79/67 + 28/41
= 1/3 + (12/67 - 79/67) + (13/41 + 28/41)
= 1/3 - 1 + 1
= 1/3
1) (1-3/4 + 2/7) - ( 1/4 - 2/5 - 1)
= 1 - 3/4 + 2/7 - 1/4 + 2/5 + 1
= (1 - 3/4 - 1/4) + (2/7 + 2/5 +1)
= 0 + 59/35
= 59/35
2) -3/5 * 7/8 + (-3)/8 * 13/5
= -3*7/5*8 + -3*13/8*5
= -3/8 * 7/5 + -3/8 * 13/5
= -3/8 * (7/5 + 13/5)
= -3/8 * 4
= -3/2
3) -3/4 * 3/7 - 12/7 * 1/4 + 3/4 * (-9)/7
= 3/4 * -3/7 - 3*4/7 * 1/4 + 3/4 * (-9)/7
= 3/4 * -3/7 - 3/4 * 4/7 + 3/4 * -9/7
= 3/4 * (-3/7 - 4/7 - 9/7)
= 3/4 * -16/7
= -12/7
5) 1/3 - 3/4 + 3/5+ 1/57 -1/36 + 1/15 - 2/9
= (1/3 - 3/4 - 1/36 - 2/9) + (3/5 + 1/15) + 1/57
= (12/36 - 27/36 - 1/36 - 8/36) + (9/15 + 1/15) + 1/57
= -2/3 + 2/3 + 1/57
= 0 + 1/57
= 1/57
6) 0,5 + 1/3 - 0,4 - 5/7 + 1/6 + 4/35 + 1/41
= 1/2 + 1/3 - 2/5 - 5/7 + 1/6 + 4/35 + 1/41
= (1/2 + 1/3 + 1/6) + (4/35 - 2/5 - 5/7) + 1/41
= (3/6 + 2/6 + 1/6) + (4/35 - 14/35 - 25/35) + 1/41
= 1 + (-1) + 1/41
= 0 + 1/41
=1/41
Chúc bạn học tốt!