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Toán Lớp 7: a)17/4-(-3/10)-21/5 b)1,5-5/4+|-7/3| c)1/4+|-1/3+7/6|-(-5/12)+(1/2)

Home/ Toán Lớp 7: a)17/4-(-3/10)-21/5 b)1,5-5/4+|-7/3| c)1/4+|-1/3+7/6|-(-5/12)+(1/2)

Toán Lớp 7: a)17/4-(-3/10)-21/5 b)1,5-5/4+|-7/3| c)1/4+|-1/3+7/6|-(-5/12)+(1/2)

Hoa Tháng Mười Một 20, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: a)17/4-(-3/10)-21/5
b)1,5-5/4+|-7/3|
c)1/4+|-1/3+7/6|-(-5/12)+(1/2)

Comments ( 2 )

hienthucthu97
20 Tháng Mười Một, 2022 at 6:19 chiều

Reply

$\\$

a,

17/4 – ( (-3)/10) – 21/5

= 17/4 + 3/10 – 21/5

= 85/20 + 6/20 – 84/20

= 7/20

$\\$

b,

1,5 – 5/4 + |(-7)/3|

= 3/2 – 5/4 + 7/3

= 18/12 – 15/12 + 28/12

= 31/12

$\\$

c,

1/4 +|(-1)/3 + 7/6| -(-5)/12 + 1/2

= 1/4 + |(-2)/6 + 7/6| + 5/12 + 1/2

= 1/4 + |5/6| + 5/12 + 1/2

= 1/4 + 5/6 + 5/12 + 1/2

= 3/12 + 10/12 + 5/12 + 6/12

= 2
khanhlanchau
20 Tháng Mười Một, 2022 at 6:18 chiều

Reply

a) 17/4-(-3/10)-21/5

=17/4+(3/10-42/10)

=17/4+(-39/10)=85/20-78/20=7/20

b) 1,5-5/4+|-7/3|

=3/2-5/4+7/3

=1/4+7/3=3/12+28/12=31/12

c) 1/4+|-1/3+7/6|-(-5/12)+(1/2)

=1/4+|5/6|+5/12+1/2

=5/6+(1/4+5/12+1/2)=5/6+7/6=2

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