Question

12.5×67+53×3.1+72×3.1 与125*1.2*1.5*1.8*35怎样计算简便?

Answer 1

12.5×67+53×3.1+72×3.1

=12.5×67+(53+72)×3.1

=12.5×67+125×3.1

=12.5×67+12.5×31

=12.5×（67+31）

=12.5×98

=12.5×(100-2)

=1250-25

=1225

125×1.2×1.5×1.8×35

=(125×1.2)×(1.5×1.8)×35

=150×2.7×35

=405×35

=(400+5)×35

=14000+175

=14175