1:用简便算法计算下面各题,5/8×4×9/10= (1/4+2/9)×3.6= 15
1:用简便算法计算下面各题,5/8×4×9/10=(1/4+2/9)×3.6=19×4/9=2:计算下面各题4/17x5=25/39x13/30=7/9x2/3-2/7=...
1:用简便算法计算下面各题,5/8×4×9/10= (1/4+2/9)×3.6= 19×4/9= 2:计算下面各题 4/17x5= 25/39x13/30= 7/9x2/3-2/7= 5/16x8/15= 6/11x7/15x10= 19/100x3/8x50=(求解答.求过程....)
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1:用简便算法计算下面各题,5/8×4×9/10= 5/2×9/10
=9/4 (1/4+2/9)×3.6= (9+8) /36×3.6
=17/10 19×4/9= 76/9 2:计算下面各题 4/17x5
= 20/17 25/39x13/30
= 5/18 7/9x2/3-2/7
= 14/27-2/7
=(98-54)/189
=44/189 5/16x8/15=1/6
6/11x7/15x10
= 28/11 19/100x3/8x50=57/16
=9/4 (1/4+2/9)×3.6= (9+8) /36×3.6
=17/10 19×4/9= 76/9 2:计算下面各题 4/17x5
= 20/17 25/39x13/30
= 5/18 7/9x2/3-2/7
= 14/27-2/7
=(98-54)/189
=44/189 5/16x8/15=1/6
6/11x7/15x10
= 28/11 19/100x3/8x50=57/16
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