Question

用简便方法计算下面各题．156+68+44 748+215-248 &...

用简便方法计算下面各题．156+68+44 748+215-248 0.8+4.7+4.2+5.3 25×78×4 3.6×5.2+6.4×5.2 14×10.1

Answer 1

①156+68+44
=156+44+68
=200+68
=268；

②让樱盯748+215-248
=748-248+215
=500+215
=715；

③0.8+4.7+4.2+5.3
=（0.8+4.2）+（4.7+5.3）
=5+10
=15；

④25×78×4
=25×4×78
=100×78
=7800；

⑤3.6×5.2+6.4×5.2 
=（3.6+6.4）×5.2
=10×5.2
=52；

⑥14×10.1
=14×（坦和10+0.1）颂码
=14×10+14×0.1
=140+1.4
=141.4．