Question

数学题目急急急急！！！！！！（巧算）

1. 4.8*2.7+32.76/6.3*2.7 2. 88.8*2.6+44.4*6*2.5 3. 24.8/（8*1.24）/1.25

Answer 1

1、
=（4.8*6.3）/6.3*2.7+32.76/6.3*2.7
=(5*6.3-0.2*6.3)/6.3*2.7+32.76/6.3*2.7
=(31.5-1.26+32.76)/6.3*2.7
=(31.5+31.5)/6.3*2.7
=63/6.3*2.7
=27

2\
=88.8*2.6+44.4*2*3*2.5
=88.8*2.6+88.8*7.5
=88.8*(2.6+7.5)
=88.8*10.1
=88.8*10+88.8*0.1
=888+8.88
=896.88

3\
=24.8/(8*1.24*1.25)
=24.8/(8*1.25*1.24)
=24.8/(10*1.24)
=24.8/12.4
=2

Answer 2

这几题，应该都能通过合并同类项来解决的
如第二题
44.4*2*(2.5+0.1)+44.4*6*2.5
也可继续提取4为同类项，4与2.5相乘计算会简便多

Answer 3

1. 4.8*2.7+32.76/6.3*2.7
=(4.8+32.76/6.3)*2.7
=(4.8+5.2)*2.7
=10*2.7
=27

2. 88.8*2.6+44.4*6*2.5
=88.8*2.6+44.4*2*3*2.5
=(2.6+3*2.5)*88.8
=(2.6+7.5)*88.8
=10.1*88.8
=896.88