*代表乘号 /代表除号1 3.14*70.1-0.314+314*0.32 1.25*67.875+1250.7875+1250*0.0533753 0.125*2.5*64*0.54 6.25*8.72*16+3.75*0.827*8

*代表乘号 /代表除号1 3.14*70.1-0.314+314*0.32 1.25*67.875+1250.7875+1250*0.0533753 0.125*2.5*64*0.54 6.25*8.72*16+3.75*0.827*8
*代表乘号 /代表除号
1 3.14*70.1-0.314+314*0.3
2 1.25*67.875+1250.7875+1250*0.053375
3 0.125*2.5*64*0.5
4 6.25*8.72*16+3.75*0.827*8

*代表乘号 /代表除号1 3.14*70.1-0.314+314*0.32 1.25*67.875+1250.7875+1250*0.0533753 0.125*2.5*64*0.54 6.25*8.72*16+3.75*0.827*8
1 3.14*70.1-0.314+314*0.3
=0.314*10*70.1-0.314+0.314*1000*0.3
=0.314*701-0.314*+0.314*300
=0.314*(701-1+300)
=0.314*1000
=314
2 1.25*67.875+125*0.7875+1250*0.053375
=1.25*67.875+1.25*100*0.7875+1.25*1000*0.053375
=1.25*67.875+1.25*78.75+1.25*53.375
=1.25*(67.875+78.75+53.375)
=1.25*200
=250
3 0.125*2.5*64*0.5
=0.125*2.5*(8*4*2)*0.5
=(0.125*8)*(2.5*4)*(2*0.5)
=1*10*1
=10
4 6.25*8.72*16+3.75*0.827*8
这个错了
应该是
6.25*0.872*16+3.75*8.72*8
=6.25*0.872*(8*2)+3.75*0.872*10*8
=(6.25*2)*0.872*8+(3.75*10)*0.872*8
=12.5*0.872*8+37.5*0.872*8
=(12.5+37.5)*0.872*8
=50*8*0.872
=400*0.872
=348.8

3.14*70.1-0.314+314*0.3
=3.14×70.1-3.14×0.1+3.14×300
=3.14×370

3.14*70.1-0.314+314*0.3
=3.14×70.1-3.14×0.1+3.14×300
=3.14×370
保证对，我做过的

1 3.14*70.1-0.314+314*0.3
=0.314*10*70.1-0.314+0.314*1000*0.3
=0.314*701-0.314*+0.314*300
=0.314*(701-1+300)
=0.314*1000
=314
2 1.25*67.875+125*0.7875+1250*0.053375
...

全部展开

1 3.14*70.1-0.314+314*0.3
=0.314*10*70.1-0.314+0.314*1000*0.3
=0.314*701-0.314*+0.314*300
=0.314*(701-1+300)
=0.314*1000
=314
2 1.25*67.875+125*0.7875+1250*0.053375
=1.25*67.875+1.25*100*0.7875+1.25*1000*0.053375
=1.25*67.875+1.25*78.75+1.25*53.375
=1.25*(67.875+78.75+53.375)
=1.25*200
=250
3 0.125*2.5*64*0.5
=0.125*2.5*(8*4*2)*0.5
=(0.125*8)*(2.5*4)*(2*0.5)
=1*10*1
=10
6.25*0.872*16+3.75*8.72*8
=6.25*0.872*(8*2)+3.75*0.872*10*8
=(6.25*2)*0.872*8+(3.75*10)*0.872*8
=12.5*0.872*8+37.5*0.872*8
=(12.5+37.5)*0.872*8
=50*8*0.872
=400*0.872
=348.8

收起

①3.14*70.1-0.314+314*0.3
=3.14*70+3.14*0.1-0.314+3.14*30
=3.14*（70+30）+0.314-0.314
=3.14*100
=314

1) 3.14*70.1-0.314+314*0.3
= 3.14*70.1-3.14*0.1+3.14*100*0.3=3.14*(70.1-0.1+30)=3.14*100=314
2) 1.25*67.875+125*0.7875+1250*0.053375
= 1.25*67.875+1.25*100*0.7875+1.25*1000*0.053375

全部展开

1) 3.14*70.1-0.314+314*0.3
= 3.14*70.1-3.14*0.1+3.14*100*0.3=3.14*(70.1-0.1+30)=3.14*100=314
2) 1.25*67.875+125*0.7875+1250*0.053375
= 1.25*67.875+1.25*100*0.7875+1.25*1000*0.053375
= 1.25*(67.875+78.75+53.375)=1.25*200=250
3) 0.125*2.5*64*0.5 = (0.125*8) * (2.5*4)*(0.5*2)=1*10*1=10
4) 6.25*8.72*16+3.75*0.827*8 = (6.25*16)*8.72+(3.75*8)*0.827
=100*8.72+30*0.827=872+24.81=896.81 (原题目的数字可能有错）

收起

1.220.742
2.1402.35
3.10
4.896.81

1 3.14*70.1-0.314+314*0.3 =314.314
2 1.25*67.875+1250.7875+1250*0.053375 =1402.35
3 0.125*2.5*64*0.5 =10
4 6.25*8.72*16+3.75*0.827*8 =878.616

1)原式=0.314*701-0.314+0.314*300
=0.314*(701-1+300)
=0.314*1000
=314
2)原式=125*0.67875+125*0.7875+125*0.53375
=125*2
=250
3)原式=0.125*8*2.5*4*0.5*2
=1*10*1
=10
4)原式=(2.5*4)^2*8.72+..
=100*8.72+..