作业帮17/5*24/9+17/9*24/19简便计算、急!
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17/5*24/9+17/9*24/19简便计算、急!
17/5*24/9+17/9*24/19简便计算、急!
17/5*24/9+17/9*24/19简便计算、急!
17/5*24/9+17/9*24/7
=17/9*24/5+17/9*24/7
=17/9*24/（5+7）
=17/9*24*12
=17/9*2/1
=34/9
分数貌似写反了
5/17*9/24+9/17*19/24
=5/17*9/24+19/17*9/24
=(5/17+19/17)*9/24
=24/17*9/24
=9/17
1 2 3 4 5 6 7 8 9 10 12 13 14 15 161 17 18 19 20 21 22 23 24 25 26 27 28 29 30 =（1 30）×（30÷2） =31×15 =465 ..
1 2 3 4 5 6 7 8 9 10 12 13 14 15 161 17 18 19 20 21 22 23 24 25 26 27 28 29 30 =（1 30）×（30÷2） =31×15 =465 ..
17/5*24/9+17/9*24/19
=17/5*24/9+17/19*24/9
=24/9*（17/5+17/19）
=24/9*17/24
=17/9
17/5*24/9+17/9*24/7
=17/9*24/5+17/9*24/7
=17/9*24/（5+7）
=17/9*24*12
=17/9*2/1
=34/9
17/7×24/9+17/9×24/5
=17*24/(7*9)+17*24/(9*5)
=17*8/3(1/7+1/5)
=17*8/3*(5+7)/35
=17*8*12/(3*35)
=17*8*4/35
=17*32/35
=544/35
99又5/1×4/5
=(100-4/5)*5/4
=25*5-1<...
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17/7×24/9+17/9×24/5
=17*24/(7*9)+17*24/(9*5)
=17*8/3(1/7+1/5)
=17*8/3*(5+7)/35
=17*8*12/(3*35)
=17*8*4/35
=17*32/35
=544/35
99又5/1×4/5
=(100-4/5)*5/4
=25*5-1
=125-1
=124
0.375×91/2+91/3×8/11
=3/8×91/2+91/3×8/11
=91*(3/4+8/33)
=91*(3*33+4*8)/132
=91*131/132
=98.25
收起
17/5*24/9+17/9*24/19
=17/5*24/9+17/19*24/9
=24/9*（17/5+17/19）
=24/9*17/24
=17/9