Question

tính nhanh

125. 98

99. 34

Answer 1

125. 98 = ( 123 + 2). 98 = 123.( 2 + 98) = 123 . 100= 12300

99. 34 = 99 .( 1+ 33) = ( 99+1) . 33 = 100 .33= 3300

 

Answer 2

125.98 = 125.(100 - 2) = 125.100 - 125.2 = 12500 - 250 = 12250

99 . 34 = (100 - 1).34 = 100.34 - 34 = 3400 - 34 = 3366 

Answer 3

125.98

=125.(100-2)

= 125.100-125.2

= 12500-250

=12250

Answer 4

99.34

= (100-1).34

= 34.100-34.1

= 3400-34

= 3366