Question

​​tính 1 cách 

thuận tiện

Answer 1

49 x 36 + 49 x 64

= 49 x (36+64)

= 49 x 100 = 4900

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g, 218 x 47 + 218 x 52 + 218

= 218 x (47+1+52)

= 218 x 100

= 21800

h, 119 x 27 - 27 x 19

= 27 x (119 - 19)

= 27 x 100

=2700

Answer 2

f: =45(36+64)=45*100=4500

g: =218(47+52+1)

=218*100=21800

h: =27(115-15)=27*100=2700

Answer 3

f, 45x 36 +45x64

=45.(36+64)

=4500

g, 218 x 47 + 218 x 52 + 218

= 218x(47+52+1)

=21800

h, 115x27-27x19

=(115-15)x27

=100 x27

=2700