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分数乘除法简便运算153103377X +X -一X 101-214214410108888X-x -9999335 X 99+ 510352033433-X- -X887879 12371263625518229X (15 X 31 )5 28x- X 8 3153253 x 4854X( 911 75112 18 247235ccc 6小80.375 2-3 -81111351921 “419725255 3丄6 8481153131126424247 112 _5959 11434265 -578 -157 -3439121 19 123344 245 0.66.8 X15X3.2101X25(90 + )88-X 39 +4X 25 +4些X卫413A x A + A151627+ * ) X 15X 112 X 7+2 X 53 3(6 _ 12X( 24 - 4 )5(5 X4 + 4)-4 1 _T(2+1)X丄777753 513门37 ,4c31113 X+X3X58+ -X41+ -811118888575918 、,9,7、,9 ,X+X +91212525162516916635341(21 X-+ -X 21)X7745 69 9X 6 510 59(99+ )- 910
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