Question

7.8x6.3 0.37x78怎样简便算

Answer 1

7.8*6.3=（8-0.2）*6.3=8*6.3-0.2*6.3=50.4-1.26=49.14
0.37*78=0.37*（80-2）=0.37*80-0.37*2=29.6-0.74=28.86

Answer 2

7.8×6.3+0.37×78
=7.8×6.3+3.7×7.8
=7.8×（6.3+3.7）
=7.8×10
=78