Question

谁帮我做这几道简算题，我是六年级的小学生

2/3+2/15+2/35+2/63+2/99+1/11 1/4X(4.85÷5/18-3.6+6.15×18/5） 100X89+100X99-89X11-89X89/54X2+99X98+45X2 [14.8+(23/7-3/2)X28/25]÷21/5 能简算的要简算的要简算
100X89+100X99-89X11-89X89/54X2+99X98+45X2这道题中的89/54种54后面是分母，89前面是分子

Answer 1

2/3+2/15+2/35+2/63+2/99+1/11
=(1-1/3)+(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+(1/9-1/11)+1/11
=1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11
=1

1/4X(4.85÷5/18-3.6+6.15×18/5）
=1/4×(4.85×18/5-3.6+6.15×18/5)
=1/4×[(4.85+6.15)×18/5-3.6]
=1/4×[39.6-3.6]
=1/4×36
=9

100X89+100X99-89X11-89X89/54X2+99X98+45X2
=(100-11-89)×89+100×99 /2×(54+45)+99×98
=100×99/2×99+99×98
=100×99/99×(2+98)
=100×99/99×100
=1

[14.8+(23/7-3/2)X28/25]÷21/5
=[14.8+23/7×28/25-3/2×28/25]÷21/5
=[14.8+92/25-42/25]÷21/5
=[14.8+2]÷21/5
=16.8×5/21
=4

Answer 2

(1)原式=2/3*(1+1/5)+2/7*(1/5+1/9)+1/11*(1+2/9)
=4/5+4/45+1/9=1
(2)v原式=1/4*(4.85*18/5-3.6+6.15*18/5)
=1/4*((4.85+6.15)*3.6-3.6)
=1/4*36=9
（3）原式=((100-11)*89+100*99-89^2)/((54+45)*2+99*98)
=9900/(99*2+99*98)
=1
（4） 原式= [14.8+(23/7)X28/25-(3/2)X28/25]X5/21
=(14.8+92/25-42/25)X5/21
=(14.8-2)X5/21
=12.8X5/21
=64/21
=12.8X5/21
=64/21

Answer 3

2/3+2/15+2/35+2/63+2/99+1/11
=(1-1/3)+(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+(1/9-1/11)+1/11
=1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11
=1

1/4X(4.85÷5/18-3.6+6.15×18/5）
=1/4X(4.85×3.6-3.6+6.15×3.6）
=1/4X3.6X(4.85-1+6.15)
=0.9X10
=9

100X89+100X99-89X11-89X89/54X2+99X98+45X2
题目看不懂
89X89/54X2 ？什么意思

[14.8+(23/7-3/2)X28/25]÷21/5
= [14.8+(23/7)X28/25-(3/2)X28/25]X5/21
=(14.8+92/25-42/25)X5/21
=(14.8-2)X5/21
=12.8X5/21
=64/21

Answer 4

有打字时间都做了，六年级题这么难