1.0.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14 2.-36×-4/9+5/6-7/12 3.99 7/8×-13 4.-17×-3 1/170.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14 2.-36×-4/9+5/6-7/12 3.99 7/8×-13 4.-17×-3 1/17
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1.0.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14 2.-36×-4/9+5/6-7/12 3.99 7/8×-13 4.-17×-3 1/17
0.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14
2.-36×-4/9+5/6-7/12
3.99 7/8×-13
4.-17×-3 1/17
1.0.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14
=0.7x85/9-11/4x14+0.7x5/9-1/4x14
=0.7x(85/9+5/9)-1/4x(11/4+1/4)
=0.7x10-1/4x3
=7-3/4
=6.25
2.-36×-4/9+5/6-7/12
=16+10/12-7/12
=-16+1/4
=-15.75
3.99 7/8×-13
=(100-1/8)x-13
=-1300+13/8
=-1298又3/8
4.-17×-3 1/17
=17x52/17
=52
1.0.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14 2.-36×-4/9+5/6-7/12 3.99 7/8×-13 4.-17×-3 1/170.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14 2.-36×-4/9+5/6-7/12 3.99 7/8×-13 4.-17×-3 1/17
5/(2*3*4)+7/(3*4*5)+9/(4*5*6)+...+19/(9*10*11)
(19 4/9+9 4/19)÷(2 7/9+1 6/19)
2/3 4/3 19/9 3 ( )
0,1,2,3,4,1,3,5,7,9,2,5,8,11,14,3,7,11,15,19,4,9,14,19,24
2-7/4+9/4-7/3
求九宫格数独9-- --- --7 --2 --- 6-- --- 6-9 --5 -9- 3-2 -5- --4 -8- 7-- -6- 7-1 -8 - --- 2-8 --4 --1 --- 3-- 25- --- -19
4/1*3+4/3*5+4/5*7+4/7*9+4/9*11+.+4/19*21计算方法
9又3/4-15*19-2/19简便算法
5/2*3*4+7/3*4*5+...+8*9*10/17+19/9*10*11求简便运算
简便计算:1155*(5/2*3*4+7/3*4*5+…+17/8*9*10+19/9*10*11)
5/(2×3×4)+7/(3×4×5)+……+17/(8×9×10)+19/(9×10×11)
7 1 5 4 3 19 3 6 8 6 3 2 6 9 81 8 41 6 9 9 2 4 4 8 2
***3***9***49*6**2*19*4***6***7***5*2*5***6*4*4***3***9***3*54*8**4*73***2***1***
① 2/3,8/9,3/4,2,( ) ② 19/13,1,13/19,10/22,( ) ③ 3/7,1/2,7/13,9/16,( )
7+1+2=321 4+5-1=416 9+5-4=19 4+2+3=?
7又2分之1乘1又4分之3除以(-9+19)
(1+3+5+7+9+.+19)--(2+4+6+8+.+18) = =.递等式 急.