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a. 63x45+63x55
=63x(45+55)
=63x100
=6300
b. 546,43 + 64 x 546,43 + 36
KO tính nhanh dc nha
(chắc đề sai)
63 . 45 + 63 . 55...........................
= 63 ( 45 + 55 )..........................
= 63 . 100 = 6300..............
45 x 38 + 45 x 63 - 45
=45 x 38 + 45 x 63 -45 x 1
=45 x (38+63-1)
=45 x 100
=4500
X x 39 + X x 63 - X - X = 3200
X x (39 + 63 - 1 - 1) = 3200
X x (102 - 2) = 3200
X x 100 = 3200
X = 3200 : 100
X = 32
Vậy X = 32
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20,21 x 36 + 63 x 20,21 + 20,21
= 20,21 x 36 + 63 x 20,21 + 20,21 x 1
= 20,21 x ( 36 + 63 + 1)
= 20,21 x 100
= 2 021
cái này là 2 phép tính riêng biệt hay là gì hả bạn ?
\(\frac{21}{11}\)x \(\frac{22}{17}\)x\(\frac{68}{63}\)
= \(\frac{42}{17}\)x\(\frac{68}{63}\)
= \(\frac{8}{3}\)
18 - x : 2 = 16
x : 2 = 18 - 16
x = 2 x 2
x = 4
\(\frac{21}{11}\times\frac{22}{17}\times\frac{68}{63}\)
\(=\frac{21}{11}\times\frac{22\times68}{17\times63}\)
\(=\frac{21}{11}\times\frac{22\times4}{1\times63}\)
\(=\frac{21}{11}\times\frac{88}{63}\)
\(=\frac{21\times88}{11\times63}\)
\(=\frac{1\times8}{1\times3}\)
\(=\frac{8}{3}\)
\(18-x:2=16\)
\(x:2=18-16\)
\(x:2=2\)
\(x=2\times2\)
\(x=4\)
21/11 x 22/17x68/63
= 7x3x2x11x4x17 / 11x17x7x3x3
=8/3
5/14x7/13x26/25
=5x7x26 / 14x13x25
= 5x7x13x2 / 7x2x13x5x5
=1/5
X x 39 + X x 63 - X - X = 3200
X x (39 + 63 - 1 - 1) = 3200
X x (102 - 2) = 3200
X x 100 = 3200
X = 3200 : 100
X = 32
Vậy X = 32