Toán Lớp 6: Bài 1 : Tính hợp lí ( Tính nhanh )
i , 3579 – ( 49 – 5 + 3579 ) + 49
j , 6 – ( 5 – 5847 ) + 5 – 5847
k , 12 . 36 – 12 . 26
l , -45 . 67 + 45 . ( -33 )
m , -4825 – ( 357 – 4825 ) + 300
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Toán Lớp 6: Bài 1 : Tính hợp lí ( Tính nhanh )
i , 3579 – ( 49 – 5 + 3579 ) + 49
j , 6 – ( 5 – 5847 ) + 5 – 5847
k , 12 . 36 – 12 . 26
l , -45 . 67 + 45 . ( -33 )
m , -4825 – ( 357 – 4825 ) + 300
Comments ( 2 )
3579
−
(
49
−
5
+
3579
)
+
49
i
)
3579
–
(
49
–
5
+
3579
)
+
49
=
3579
−
49
+
5
−
3579
+
49
=
3579
–
49
+
5
–
3579
+
49
=
(
3579
−
3579
)
+
(
49
−
49
)
+
5
=
(
3579
–
3579
)
+
(
49
–
49
)
+
5
=
0
+
0
+
5
=
0
+
0
+
5
=
5
=
5
j
)
6
−
(
5
−
5847
)
+
5
−
5847
j
)
6
–
(
5
–
5847
)
+
5
–
5847
=
6
−
[
(
5
−
5
)
+
(
5847
−
5847
)
]
=
6
–
[
(
5
–
5
)
+
(
5847
–
5847
)
]
=
6
−
[
0
+
0
]
=
6
–
[
0
+
0
]
=
6
−
0
=
6
–
0
=
6
=
6
k
)
12.36
−
12.26
k
)
12.36
–
12.26
=
12
(
36
−
26
)
=
12
(
36
–
26
)
=
12.10
=
12.10
=
120
=
120
l
)
−
45.67
+
45
.
(
−
33
)
l
)
–
45.67
+
45
.
(
–
33
)
=
(
−
45
)
.67
+
(
−
45
)
.33
=
(
–
45
)
.67
+
(
–
45
)
.33
=
(
−
45
)
.
(
67
+
33
)
=
(
–
45
)
.
(
67
+
33
)
=
(
−
45
)
.100
=
(
–
45
)
.100
=
−
4500
=
–
4500
m
)
−
4825
−
(
357
−
4825
)
+
300
m
)
–
4825
–
(
357
–
4825
)
+
300
=
(
−
4825
)
−
357
+
4825
+
300
=
(
–
4825
)
–
357
+
4825
+
300
=
[
(
−
4825
)
+
4825
]
−
(
357
−
300
)
=
[
(
–
4825
)
+
4825
]
–
(
357
–
300
)
=
0
−
57
=
0
–
57
=
−
57
=
–
57
#dương
i)3579-(49-5+3579)+49
=3579-49+5-3579+49
=(3579-3579)+(49-49)+5
=0+0+5
=5
j)6-(5-5847)+5-5847
=6-[(5-5)+(5847-5847)]
=6-[0+0]
=6-0
=6
k)12.36-12.26
=12(36-26)
=12.10
=120
l)-45.67+45.(-33)
=(-45).67+(-45).33
=(-45).(67+33)
=(-45).100
=-4500
m)-4825-(357-4825)+300
=(-4825)-357+4825+300
=[(-4825)+4825]-(357-300)
=0-57
=-57
\text{# Mạc}