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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
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, 15 x (24 : 6)
Cách 1: 15 x (24 : 6 ) = 15 x 4 = 60
Cách 2: 15 x (24 : 6 ) = (15 x 24) : 6 = 60
b, 72 : (9 x 8)
Cách 1: 72 : (9 x 8) = 72 : 72 = 1
Cách 2: 72 : (9 x 8) = ( 72 : 9) x 8 = 8 : 8 = 1
(72 x 135 + 9 x 28 x 15 ) : 25 - 3500 : 25
= ( 72 x 135 + 28 x 135 ) : 25 - 3500 : 25
= [ 135 x ( 72 + 28 ) ] : 25 - 3500 : 25
= ( 135 x 100 ) : 25 - 3500 : 25
= 13500 : 25 - 3500 : 25
= 25 x ( 13500 - 3500 )
=25 x 10000
= 250000
a: =428(36+64)=42800
b: =512(47-37)=5120
c: =72x100=7200
a) 72 + 9 + 8 = ( 72 + 8 ) + 9
= 80 + 9
= 89
b)37 + 18 + 3 = ( 37 + 3 ) + 18
= 40 + 18
= 58
c) 48 + 26 + 4 = 48 + (26 + 4)
= 48 + 30
= 78
d)85 + 99 + 1 = 85 + ( 99 + 1 )
= 85 + 100 = 185
e) 67 + 98 + 33 = ( 67 + 33 ) + 98
= 100 + 98 = 198
\(a,C1:\left(524-168\right):4=356:4=89\\ C2:\left(524-168\right):4=524:4-168:4=131-42=89\)
\(b,C1:72:\left(9\times4\right)=72:36=2\\C2:72:\left(9\times4\right)=\left(72:9\right):4 =8:4=2\)
\(c,C1:\left(25\times72\right):9=1800:9=200\\ C2:\left(25\times72\right):9=25\times\left(72:9\right)=25\times8=200\)
a,C1:(524−168):4=356:4=89C2:(524−168):4=524:4−168:4=131−42=89a,C1:(524−168):4=356:4=89C2:(524−168):4=524:4−168:4=131−42=89
b,C1:72:(9×4)=72:36=2C2:72:(9×4)=(72:9):4=8:4=2b,C1:72:(9×4)=72:36=2C2:72:(9×4)=(72:9):4=8:4=2
c,C1:(25×72):9=1800:9=200C2:(25×72):9=25×(72:9)=25×8=200