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a)A - 357 = 2156 và A - 2156 = 357
b)B + 7436 = 9475 và 9475 - B = 7436
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a) \(A=10-1\frac{1}{6}.\frac{6}{7}\)
\(=10-\frac{7}{6}.\frac{6}{7}\)
\(=10-1=9\)
b) \(B=21:\frac{11}{2}+5\frac{2}{11}\)
\(=\frac{42}{11}+\frac{57}{11}=9\)
c) \(A=9;B=9\)
\(A.B=9.9=81\)
d) \(A=9;B=9\)
\(A:B=9:9=1\)
a) A = \(10-1\frac{1}{6}\times\frac{6}{7}\)= \(10-\frac{7}{6}\times\frac{6}{7}\)= 10 - 1 = 9
b) B = \(21:\frac{11}{2}+5\frac{2}{11}\)= \(\frac{42}{11}+\frac{57}{11}\)= 9
c) A x B = 9 x 9 = 81
c) A : B = 9 : 9 = 1
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a=b
2(a-10)=b+10
a-10=(b+10):2
a-10=b:2+10:2
a-10=b:2+5
a=b:2+5+10
a=b:2+15
Mà a=b
a=b=b:2+15
b:2+15=b
b:2-b=-15
\(\frac{b}{2}-\frac{b}{1}=-15\)
\(\frac{b}{2}-\frac{2b}{2}=\frac{-30}{2}\)
b-2b=-30
-b=-30
=>b=30
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1)
a) \(34,2:36=0,95\)
b) \(36,18:18=2,01\)
c) \(5,05:25=0,202\)
d) \(17,25:75=0,23\)
2)
a) \(75,52:32=2,36\)
b) \(4,68:13=0,36\)
c) \(81,6:34=2,4\)
d) \(134,4:42=3,2\)
3)
a) \(882:36=24,5\)
b) \(78:24=3,25\)
c) \(3:15=0,2\)
d) \(15:75=0,2\)
4)
a) \(3:75=0,04\)
b) \(750:300=2,5\)
c) \(390:12=32,5\)
d) \(54:24=2,25\)
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\(B-A=\left(1993x477\right)-\left(1993x427\right)\)
\(=1993x\left(477-427\right)\)
\(=1993x50\)
\(=99650\)
Gửi : Linh (hs lớp 5)
Từ : Hs lớp 6.
Ta có : B = 477 x 1993 = ( 427 + 50 ) x 1993 = 427 x 1993 + 50 x 1993
B - A = 427 x 1993 + 50 x 1993 - 1993 x 427
= ( 427 x 1993 - 1993 x 427 ) + 50 x 1993
= 0 + 99 650 = 99 650
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a,37,383 + 96,152 = 133,535
b,493,249 -328,2 =245,049
c,384,2 x 200 =76840
d,349,32 : 4=87,33
2.tính nhanh
47,328+200,2 x 53,672+799,8
=(47,328+53,672) x (200,2 + 799,8)
= 100 x 1000
=100 000
b,300,123 +32,41-699,877+67,59
=(300,123+699,877)-(32,41+67,59)
= 1000 - 100
=900