## Tính thuận tiện a)15,27-4,18-2,09 b)45,28+52,17-15,28-12,17 c)54,27+16,9-2,27 d)7/15+7/4+8/15+5/4

Question

Tính thuận tiện
a)15,27-4,18-2,09
b)45,28+52,17-15,28-12,17
c)54,27+16,9-2,27
d)7/15+7/4+8/15+5/4

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2 tháng 2021-10-13T17:30:55+00:00 2 Answers 5 views 0

1. a, 15,27 – 4,18 – 2,09

= ( 15,27 – 4,18 ) – 2,09

= 11,09 – 2,09

= 9

b, 45,28 + 52,17 – 15,28 – 12,17

= ( 45,28 – 15,28 ) + ( 52,17 – 12,17 )

= 30 + 30

= 60

c, 54,27 + 16,9 – 2,27

= ( 54,27 – 2,27 ) + 16,9

= 52 + 16,9

= 68,9

d, $\frac{7}{15}$  + $\frac{7}{4}$  + $\frac{8}{15}$ + $\frac{5}{4}$

= ( $\frac{7}{15}$ + $\frac{8}{15}$ ) + ( $\frac{7}{4}$ + $\frac{5}{4}$ )

= 1 + 3

= 4

2. a)$15,27 – 4,18 – 2,09$

$= 11,09 – 2,09$

$=9$

b) $45,28+52,17-15,28-12,17$

$=45,28 – 15,28 + 52,17 – 12,17$

$=30 + 40$

$=70$

c) $54,27 + 16,9 – 2,27$

$=54,27 – 2,27 + 16,9$

$= 52 + 16,9$

$= 68,9$

d) $\frac{7}{15}$ + $\frac{7}{4}$+ $\frac{8}{15}$+ $\frac{5}{4}$

= $\frac{7}{15}$ + $\frac{8}{15}$ + $\frac{7}{4}$+ $\frac{5}{4}$

=  $1 + 3$

= $4$

HỌC TỐT!!!