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a.11/7.8/13+8/13.3/7+8/13
=8/13.(11/7+3/7+1)
=8/13.3
=24/13
b.5/7.8/13+8/13.9/7-8/13
=8/13.(5/7+9/7-1)
=8/13.1
=8/13
c.157.199-56.199-199
=199.(157-56-1)
=199.100
19900
\(99\times36+57\times99+99-84\times99\)
\(=99\times(36+57+1-84)\)
\(=99\times10=990\)
99 x 36 + 57 x 99 - 84 x 99
= 99 x ( 36 + 57 + 1 - 84 )
= 99 x 10
= 990
a.(64 - 32 ) :8 = 32 : 8 = 4
b. 36 x 2 x7 + 36 x 86
= 36 x (14 + 86)
= 36 x 100
= 3600
68:8 - 32 : 8
= ( 68 - 32): 8
= 36 : 8
= 4,5
72 x 7 + 36 x 86
= 72 x 7 + 36 x 2 x 43
= 72 x 7 + 72 x 43
= 72 x ( 7 + 43)
= 72 x 50
= 3600
C1:
a. 786 x ( 32 +68)
= 786 x 100
= 78600
b. 2904 x 15 + 2904 x 35
= 43560 + 101640
= 145200
c.436 x 72 - 436 x 42
= 31392 - 18312
= 13080
d.194 x (87-7)
= 194 x 80
=15520
e.3332 : (4x49)
= 3332 : 196
= 17
f. 72 : 9 : 8
= (72 : 9) :8
= 1
g. (15 x 24) : 6
= 360 :6
= 60
m. 25 x(36 :9)
= 25 x 4
= 100
Cách 2:
a.786 x 32 + 786 x 68
= 25152 + 53448
= 78600
b. 2904 x ( 15 + 35)
= 2904 x 50
= 145200
c.436 x (72 -42)
= 436 x 30
= 13080
d.194 x 87 - 194 x7
= 16878 - 1358
= 15520
e. 3332 : (4 x 49)
= 3332 : 4 : 49
= 833 : 49 = 17
f. 72 : 9 :8
= 72 : (9 x8)
= 72 : 72
=1
g. (15 x 24) :6
= 15 x (24 :6)
= 15 x 4
= 60
m. 25 x (36 :9)
= ( 25 x36 ):9
= 900 : 9
=100
A=[(38+17)+125]+29
A=175+29
A=204
B=312.3
B=936
C=1+1+1+1+1
C=5
D=(125:5).(36:9)
D=25.4
D=100
35 x 20 x 5 8 x 9 x 125 25 x 7 x 4 72:(8x3)
= 35 x ( 20 x5 ) = ( 8x125) x 9 = (25x4)x7 = 72: 24
= 35 x 100 = 1 000 x 9 = 100x7 = 3
= 3 500 = 9 000 =700
(36x7):4
=36: 4 x 7
= 9 x7
= 63
35 x 20 x 5 = 35\(\times\)(20 \(\times\)5)= 35 \(\times\)100=3500
8 \(\times\)9 \(\times\) 125 =(8\(\times\) 125)\(\times\)9=1000\(\times\)9=9000
25 \(\times\)7\(\times\)4=(25 \(\times\)4)\(\times\)7=100\(\times\)7=700
72 : (8\(\times\)3)=72 : 8 x 3 =(72:8) x 3=9 x 3=27
(36 x 7) : 4 =36 x 7 : 4 =7 x (36 :4)=7 x 9=63
a: =428(36+64)=42800
b: =512(47-37)=5120
c: =72x100=7200
\(428×(36+64)\)
\(=428×100\)
\(=42800\)
\(512×(47-37)\)
\(=512×10\)
\(=5120\)
\(72×(4×25)\)
\(=72×100\)
\(=7200\)
\(\left(\dfrac{4+5}{9}\right)\text{×}\dfrac{3}{7}\)
\(=1\text{×}\dfrac{3}{7}\)
\(=\dfrac{3}{7}\)
\(a,C1=744+186\\ =930\\ C2=93\times\left(8+2\right)\\ =93\times10=930\\ b,C1:=324+576\\ =900\\ C2=9\times\left(36+64\right)\\ =9\times100\\ =900\\ c,C1=456-399\\ =57\\ C2=57\times\left(8-7\right)\\ =57\)
\(a)\)\(93\times8+93\times2\)
\(=98\times\left(8+2\right)\)
\(=98\times10\)
\(=980\)
\(b)36\times9+64\times9\)
\(=9\times\left(36+64\right)\)
\(=9\times100\)
\(=900\)
\(c)57\times8+57\times7\)
\(=57\times\left(8-7\right)\)
\(=57\times1\)
\(=57\)