3.5* 98+0.2*35=350怎么算出来的？

3.5* 98+0.2*35=350怎么算出来的？

3/7-2/5+4/7-3/5=(3+4)/7-(2+3)/5=0
0.16+4÷（3/8－1/8）=0.16+4*4=16.16
5/6 × 2/3+ 4/9 ÷ 1/6 =5/9+24/9=29/9
3.5×98+0.2×35=35*(9.8+0.2)=350
5/12 × 1/3 － 1/4÷13=1/4(5/9-1/13)=1/4 * (65-9)/117=14/117
6÷3/5－3/5÷6=10-1/10=9.9
1.7+5.02+3.98=1.7+5+(0.02+3.98)=10.7
3/8×{8/9（5/6－3/4）} =3/8 * 8/9 *( 10/12- 9/12)=1/3 * 1/12 =1/36

3.5* 98+0.2*35
=35*9.8+35*0.3
=35*10
=350

1. 3/7-2/5+4/7-3/5=（3/7+4/7）-（2/5+3/5）
=1-1
=0
2. =0.16+4÷1/4=0.16+16=16.16
3. = 5/6×2/3+4/9×6=5/9+24/9=29/9
4. =3.5（98+2）=3.5×100=350

3.5* 98+0.2*35=35x9.8+35x0.2=35x(9.8+0.2)=35x10=350
3/7-2/5+4/7-3/5=(3/7+4/7)-(2/5+3/5)=1+1=2
0.16+4÷（3/8-1/8）=0.16+4÷1/4=0.16+16=16.16
6分之5×3分之2+9分之4÷6分之1=5/6x2/3+4/9x6=5/9+24/9=29/9
3.5×98+0.2×35=3.5x98+2x3.5=3.5x100=350
12分之5×3分之1 －4分之1÷13=5/36-1/4x1/13=5/16-1/52=61/208
6÷5分之3－5分之3÷6=6x3/5-3/5x1/6=3/5(6-1/6)=3/5x35/6=7/2
1.7+5.02+3.98=1.7+9=10.7
8分之3×{9分之8（6分之5－4分之3）} =3/8{8/9x1/12}=3/8x2/27=1/36