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a) 53.39 + 47.39 - 53.21 - 47.21
= 53.(39 - 21) + 47.(39 - 21)
= 53.18 + 47.18
= 18.(53 + 47)
= 18.100
= 1800
b) = ( 2 x 12 ) x 53 + ( 4 x 6 ) x 87 - ( 3 x 8 ) x 40
= 24 x 53 + 24 x 87 - 24 x 40
= 24 x ( 53 + 87 - 40 )
= 24 x 100
= 2400
Chúc bạn học tốt :3
\(\frac{32\times53-21}{53\times31+32}\)
\(=\frac{\left(31+1\right)\times53-21}{53\times31+32}\)
\(=\frac{31\times53+53-21}{53\times31+32}\)
\(=\frac{31\times53+32}{53\times31+32}\)
\(=1\)
\(\frac{32\times53-21}{53\times31+32}=\frac{\left(31+1\right)\times53-21}{31\times53+32}\)
\(=\frac{31\times53+53-21}{31\times53+32}=\frac{31\times53+32}{31\times53+32}\)
\(=1\)
a) ( 735 - 135 ) + ( 243 - 143 ) = 600 + 100
= 700
b) 31 x ( 118 - 48 ) = 31 x 70
= 2170
c) ( 25 x 32 ) x7 = 800 x 7
= 2400
d ) 47 x ( 63 + 47 ) - 38
= 47 x 100 - 38
= 4700 - 38
=4662
h ) ( 53 + 47 ) x ( 39 + 21 ) = 100 x 60
= 6000
X=(1800+600):30):560:(315:35)
X=(2400:30):560:9
X=80:560:9
X=80x1/560x1/9
X=1/7x1/9
X=1/63
A=58x72+63x81-58x52-63x61
= (58x72-58x52)+(63x81-63x61)
= 58(72-52)+63(81-61)
= 58x20+63x20
= 1160+1260
= 2420
b, 53.39 + 47.39 - 53.21 - 47.21
= 39( 53 + 47) - 21 53 + 47)
= 39.100 - 21.100
= 100(39 - 21)
= 100. 18
= 1800
bấm cho mình đúng nha ^_^
a)=78.(31+24+17)+22.72
=72.(78+22)
=72.100
=7200
b)=39.(53+47)-21.(53+47)
=100.(39-21)
=100.18
=1800
a) 81 + 243 + 19 = (81 + 19) + 243
= 100 + 143 = 243
b) 168 + 79 + 132 = (168 + 132) + 79
= 300 + 79 = 379
c) 5 x 25 x 2 x 16 x 4 = (5 x 2) x (25 x 4) x 16
= 10 x 100 x 16 = 16000
d) 32 x 47 + 32 x 53 = 32 x (47 + 53)
= 32 x 100 = 3200
e) 26 + 27 + 28 + 29 + 30 + 31 + 32 = (26 + 32) + (27 + 31) + (28 + 30) + 29
= 58 + 58 + 58 + 29
= 58 x 3 + 29 = 174 + 29 = 203
a) 32 x 53 -21 / 53 x 31 + 32
= (31+1)x 53 -21/ 53 x 31+32
=31x53 + 53 x 1/ 53 x31 +32
=31 x 53 +53/ 53 x 31 +32
=53/32
k cho mình nha
32 x 53 -21 / 53 x 31 + 32
= ( 31 + 1 ) x 53 - 21 / 53 x 31 + 32
= 31 x 53 + 53 x 1 / 53 x 31 + 32
= 31 x 53 + 53 / 53 x 31 +32
= 53 / 32
Xong !