Question

0.77×10.2×12点五的简便计算？

Answer 1

0.77×10.2×12点五的简便计算
=（12.5×10+12.5×0.2）×0.77
=（125+2.5）×0.77
=127.5×0.77
=98.175

Answer 2

把12.5变成100/8,就简便了。
0.77×10.2×12点五
=0.77×10.2×100/8
=7.7*102/8
=7.7*51/4
=(8-0.3)/4*51
=2*51-0.3*51/4

=98.175

Answer 3

=0.77×10.2×12.5=0.77×【（10+0.2）×12.5】=0.77×（125+2.5）=0.77×（100+27.5）=77+0.77×27.5=77+0.77×（30－2.5）=77+23.1－0.77×（2+0.5）=100.1－1.54－0.385=99.56－0.385=99.175

Answer 4

0.77×10.2×12.5
＝0.77×5.1×（2×12.5）
＝0.77×5.1×25
＝0.77×5.1×（25×4）÷4
＝0.77×100×（5.1÷4）
＝77×1.275
＝70×1.275＋7×1.275
＝89.25＋8.925
＝98.175