Current location - Training Enrollment Network - Mathematics courses - Unit 1, Volume 2, Grade 5 Mathematics, ingenious calculation of inquiry questions, 87 times 86 volumes 85 195 times 196 volumes 195.
Unit 1, Volume 2, Grade 5 Mathematics, ingenious calculation of inquiry questions, 87 times 86 volumes 85 195 times 196 volumes 195.
87*85/86

=(86+ 1)*85/86

=86*85/86+85/86

=85 and 85/86

195* 195/ 196

= 195*( 1- 1/ 196)

= 195- 195/ 196

= 194 and1196

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