怎样简便怎样算2.8x2.48+2.8x1.52 1.14x8-1.14+1.14x3= =0.36x7.5+0.036

2.8x2.48+2.8x1.52
= 2.8×（2.48+1.52）2.8×4 = 11.2
1.14x8-1.14+1.14x3
=1.14×（8- 1+3） =1.14×10=11.4
0.36x7.5+0.036x25
=0.36x7.5+0.36x2.5 = 0.36x（7.5+2.5） =0.36x10 =3.6
0.375x101-37.5
=0.375x100+0.375-37.5=0.375
2.5x32x1.25
=2.5x（4x8）x1.25=（2.5x4）x（1.25x8）=10x10 =100
6.25x1.02/1.5
=（6.25/5）x（1.02/0.3）=1.25x3.4=1.25x（2x1.7）=2.5x1.7=4.25
32.5x3.5+32.5x6.5
=32.5x（3.5+6.5）=32.5x4=30x4+2.5x4 =120+10 =130
17.5/12.5x1.8
= 2.52
19.44/2.7-6.49
=（19.44/9）/（2.7/9）-6.49=2.16/0.3 -6.49 =7.2-6.49 = 0.71
12.5x0.7x0.8
=（2.5x5）x0.7x0.8 = （2.5x0.8）x（5x0.7）= 2x3.5 =7
1.2x2.5+0.8x2.5
=2.5x（1.2+0.8）= 2.5x2 =5
2.01x7.5-4.5x2.0
= 2.0x7.5+0.01x7.5-4.5x2.0 =2.0x（7.5-4.5）+0.075=6.075
列方程：
1.15+2X=38/2 X=2
2.（X+6）/4 = 7.5x2 X=54
3.5.8X + 2.2X = 59.2 X=7.4
4.0.38 = 3X - 20.2 X=6.86

2.8x2.48+2.8x1.52 1.14x8-1.14+1.14x3
= 2.8x(2.48+1.52) =1.14x(8-1+3)

0.36x7.5+0.036x25 0.375x101-...

你的问题太多了吧！

这么多，悬赏分加多点

2.8*2.48+2.8*1.52=2.8*（2.48+1.52）=2.8*4=11.2

2.8x2.48+2.8x1.52 1.14x8-1.14+1.14x3
= 2.8x(2.48+1.52) =1.14x(8-1+3)
解方程
3.5-5x=2 7x+3=24
-5x=2-3.5 7x=24-3