Question

thực hiện các phép tính sau bằg cách hợp lí

a) 341 . 67 + 341 .16 + 659 .83

b) 42 . 53 + 47 . 156 - 47 . 114

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Answer 1

a) 341 . 67 + 341 . 16 + 659 . 83

= 341 . (67 + 16) + 659 . 83

= 341 . 83 + 659 . 83

= 83 .( 341+659)

= 83 . 1000 = 83000

b) 42 .53+ 47 . 156 -47 . 114

= 42 . 53 + 47. ( 156 -114)

=42 . 53 + 47 . 42

= 42 .(53 +47)

= 42 .100 =4200

Answer 2

a, \(341.67+341.16+659.83\)

\(=341\left(67+16\right)+659.83\)

\(=341.83+659.83\)

\(=83\left(341+659\right)\)

\(=83.1000=83000\)

b, \(42.53+47.156-47.114\)

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

\(=42.53+47.42\)

\(=42\left(53+47\right)\)

\(=42.100=4200\)

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Answer 3

a $341.67+341.16+659.83$

$=341\left(67+16\right)+659.83$

$=341.83+659.83$

$=83\left(341+659\right)$

$=83.1000=83000$

b, $42.53+47.156-47.114$

$=42.53+47\left(156-114\right)$

$=42.53+47.42$

$=42\left(53+47\right)$

$=42.100=4200$