Question

数学计算题！能简便的简便！过程！过程！

3.9×5.5-3.9×4.5 20-7.12-4.13-6.75 4-3.25÷1.3×0.5 25+10.2÷（8.4-6.7）
36×10.1 8.8×1.3+1.2×1.3 15×19.9 0.8×0.25×4×1.25
7.27÷4÷0.25 3.14×0.2+6.86×0.2

Answer 1

1.3.9×5.5-3.9×4.5
=3.9×(5.5-4.5)=3.9
2.20-7.12-4.13-6.75
=20-(7.12+4.13)-6.75
=20-(11.25+6.75)
=20-18
=2
3.4-3.25÷1.3×0.5
=4-(3.9-0.65)÷1.3×0.5
=4-(3.9÷1.3×0.5-0.65÷1.3×0.5)
=4-(1.5-0.25)
=4-1.25
=2.75
4.25+10.2÷（8.4-6.7）
=25+10.2÷1.7
=25+6
=31
5.36×10.1
=36×(10+0.1)
=36×10+36×0.1
=360+3.6
=363.6
6.8.8×1.3+1.2×1.3
=(8.8+1.2)×1.3
=10×1.3
=13
7.15×19.9
=15×(20-0.1)
=15×20-15×0.1
=300-1.5
=298.5
8.0.8×0.25×4×1.25
=(0.8×1.25)×(0.25×4)
=1×1
=1
9.7.27÷4÷0.25
=7,27÷(4×0.25)
=7.27÷1
=7.27
10.3.14×0.2+6.86×0.2
=(3.14+6.86)×0.2
=10×0.2
=2

Answer 2

3.9×（5.9-4.9）=3.9
20-（7.12+4.13+6.75）=2
4-3.25÷1.3×0.5=2.75
25+10.2÷（8.4-6.7）=31
36×（10+0.1）=360+3.6=363.6
（8.8+1.2）×1.3=13
15×（20-0.1）=300-1.5=298.5
0.8×1.25×0.25×4=1
7.27÷（4×0.25）=7.27
（3.14+6.86）×0.2=2
兄台，以后还是试着自己搞定吧。

Answer 3

（1）3.9×5.5-3.9×4.5=3.9×（5.5-4.5）=3.9
（2）20-7.12-4.13-6.75 =20-（7+0.12）-（4+0.13）-（6+0.75）=20-7-4-6-（0.12+0.13+0.75）=3-1=2
（4）36×10.1=36×（10+0.1）=360+3.6=363.6
（5）8.8×1.3+1.2×1.3 =1.3×（8.8+1.2）=1.3×10=13
（6） 0.8×0.25×4×1.25=1
不做了，太无聊了。先这些吧

Answer 4

.3.9×5.5-3.9×4.5 = 3.9×(5.5+4.5)=3.9×10=39
20-7.12-4.13-6.75 =20-(7.12+4.13+6.75) =20-18=2
4-3.25÷1.3×0.5 =4-2.5×0.5=4-1.25=2.75
25+10.2÷（8.4-6.7）=25+10.2÷1.7=25+6=31
36×10.1 =36×(10+0.1)=36×10+36×0.1=360+3.6=363.6
8.8×1.3+1.2×1.3 =(8.8+1.2)×1.3=10×1.3=13
15×19.9 =15×(20-0.1)=15×20-1.5×0.1=300-0.15=299.85
0.8×0.25×4×1.25=(0.8×1.25)×(0.25×4)=1×1=1
7.27÷4÷0.25 =7.27÷(4×0.25)=7.27÷1=7.27
3.14×0.2+6.86×0.2=(3.14+6.96)×0.2=10×0.2=2

Answer 5

3.9×5.5-3.9×4.5=3.9*(5.5-4.5)=3.9
20-7.12-4.13-6.75 =20-(7.12+4.13+6.75)=20-18=2
4-3.25÷1.3×0.5 =4-(3.25/0.5)*1.3=4-6.5*1.3=-4.45
25+10.2÷（8.4-6.7）=25+10.2/1.7=31
36×10.1 =36*(10+0.1)=360+3.6=363.6
8.8×1.3+1.2×1.3 =1.3*(8.8+1.2)=13
15×19.9=15*(20-0.1)=300-1.5=298.5
0.8×0.25×4×1.25=(0.8*1.25)*(0.25*4)=1
7.27÷4÷0.25=7.27/(4*0.25)=7.27
3.14×0.2+6.86×0.2=0.2*(3.14+6.86)=2