Question

计算下列各题，能简算的要简算．5.69+4.31x13.5？

Answer 1

5.69+4.31*13.5=63.875这个没有简算，直接按四则运算进行计算的。

Answer 2

5.69+4.31x13.5
=0.001x(5690+431x135)
=0.001x5x(2x569+2x431+25x431)
=0.001x5x(2000+25x400+25x30+25)
=10+50+3.75+0.125
=63.875

Answer 3

5.69+4.31x13.5
=5.69+4.31+4.31×12.5
=10+4×12.5+0.3×12.5+0.01×12.5
=10+5+3.75+0.125
=15+3.875
=18.875

Answer 4

4.31+1.38+4.31*13.5=
4.31*14.5+1.38=
4.31*(10+4+0.5)+1.38=
43.1+17.24+2.155+1.38=
60.34+3.535=63.845

Answer 5

解:原式=5.69+58.185
=63.875。
加减乘除法运算:先算乘除，再算加减。