17/20×2/3+17/20×1/3-1/2和(3/4-4/9)×36简便算法
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17/20×2/3+17/20×1/3-1/2和(3/4-4/9)×36简便算法
17/20×2/3+17/20×1/3-1/2和(3/4-4/9)×36简便算法
17/20×2/3+17/20×1/3-1/2和(3/4-4/9)×36简便算法
17/20×2/3+17/20×1/3-1/2
=17/20×(1/3+1/3)-1/2
=17/20-1/2
=7/20
(3/4-4/9)×36
=3/4×36-4/9×36
=27-16
=11
17/20×2/3+17/20×1/3-1/2
=17/20×﹙2/3+1/3﹚-1/2
=17/20×1-1/2
=17/20-1/2
=17/20-10/20
=7/20
﹙3/4-4/9﹚×36
=3/4×36-4/9×36
=27-16
=11
17/20×2/3+17/20×1/3-1/2
=17/20×(1/3+1/3)-1/2
=17/20-1/2
=7/20
(3/4-4/9)×36
=3/4×36-4/9×36
=27-16
=11
20/17-(3/17+3分之2)简便算法
17分之20-(17分之3+3分之2)
17/20×2/3+17/20×1/3-1/2和(3/4-4/9)×36简便算法
简便计算:20+19-18+17-16+.+3-2+1
20-19+18-17+.+4-3+2-1巧算
20分之17×3分之2+20分之17×3分之1-2分之1的简便算法
求用简便方法计算题17/20*7/17-17/20*1/3
-3/17*8+20/17*8
(17/20+14.15)*[1-(-1/2)÷7/8]-(-2)^3*(-1/2)^2
1/17+2/17+3/17+4/17+...+15/17+16/17
1/17+2/17+3/17+...+15/17+16/17+1+16/17+15/17+...+3/17+2/17+1/17=
20-19+18-17+…+4-3+2-1简便计算20-19+18-17+…+4-3+2-1===
[17/25-(2/5+3/20]×2/13
找规律.3,9,11,17,20,___,___.1,3,2,6,4,___,____.
1/3+1/6+1/2= 一又4/5-7/20-9/20= 17/20-(3/8+1/5)= 13/17-(5/17+1/10)+0.9=(全要递等式)能简便就要简便
找规律:1,2,3,6,11,( ),20,( ).1,2,5,9,17,( ),65,( ).
1/1*2*3*4+1/2*3*4*5+1/3*4*5*6.+1/17*18*19*20
算一算10/7x-(17-20x)/3=1