\(42.53+47\left(156+114\right)\)

\(42.53+47.270\)

\(hixx\)\(\text{quên ùi}\)

hhhhhhhhhhhhhhhhh

42 x 53 + 47 x 156 + 47 x 114

= 42 x 53 + 47 x ( 156 + 114 )

= 42 x 53 + 47 x 270

= 2226 + 12690

= 14916

47 x 53 + 47 x 156 + 47 x 114

=47x(53+156+114)

=47x323

=15181

Hướng dẫn giải:

a) 93 + 39 + 7 = (93 + 7) + 39 = 100 + 39 = 139.

89 + 85 + 11 = (89 + 11) + 85 = 100 + 85 = 185

184 + 66 + 16 = (184 + 16) + 66 = 200 + 66 = 266

b) 23 + 52 + 47 + 98 = (23 + 47) + (52 + 98) = 70 + 150 = 220

16 + 490 + 84 + 10 = (16 + 84) + (490 + 10) = 100 + 500 = 600 

số số hạng có trong biểu thức trên là:

(58 - 40 ) : 1 + 1 = 19

=>( 40 - 41 ) + ( 42 - 43 ) + ... + ( 56 - 57 ) + 58

=> (-1) x  [( 19 - 1 ) : 2 ] + 58

=> (-1) x 9 + 58

=> (-9) + 58
=> 49
HT~~~

a) 25 × 34 × 4 = 25 × 4 × 34 = 100 × 34 = 3400

b) 128 × 93 + 128 × 7 = 128 × (93 + 7) = 128 × 100 = 12800

c) 57 × 63 - 47 × 63 = 63 × (57 – 47) = 63 × 10 = 630

c,123.456456-456.123123

=123.456.1001-456.123.1001

=0

d,42.53+47.156-47.114

=42.53+47.(156-114)

=42.53+47.42

=42.(53+47)

=42.100

=4200

c)123.456456 - 456.123123= 123. 456.1001 -456.1001.123=456.(1001-1001).123=456.0.123=0

D)42.53+47.156-47.114 = 42.53+ [47.(156-114)=42.53+47.42= 42.(53+47)=42.100 = 4200

TL

\(\frac{7}{8}\)+\(\frac{4}{23}\)+\(\frac{42}{23}\)=\(\frac{7}{8}+2\)=\(\frac{23}{8}\)

nha bn

HT

\(TL:\)

\(\frac{7}{8}+\frac{4}{23}+\frac{42}{23}\)

\(=\frac{7}{8}+\left(\frac{4}{23}+\frac{42}{23}\right)\)

\(=\frac{7}{8}+\frac{46}{23}\)

\(=\frac{7}{8}+2\)

\(=\frac{7}{8}+\frac{16}{8}\)

\(=\frac{23}{8}\)

\(=2\frac{7}{8}\)

\(HT!\)

47 x 298 + 53 x 298

= 298 x (47 + 53)

= 298 x 100 

= 29 800

\(47\times298+53\times298=298\times\left(47+53\right)\)

\(=298\times100=29800\)

47 x 298 + 53 x 298

=( 47 + 53 ) x 298

= 100 x 298

= 29 800