25X40 = 2 - - =\r5\r4 1 1\r14----= --------= 1.25X3X8 = 324-53X0 \r9 3 4\r(0. 18 + 0 .9 ) 4-9 = 0.9 + 99X0. 9=\r2b¸ 0ef¸ ¹f¸\r1 3 1\r( - - - ) X45 (`+0) X ( 1 - - )\r3 5 8 4 J\r1 1 1 1\r4X 0 .8 X 2 .5 X 1 2 .5 - X - - X -\r4 5 5 4.\r3\r3 3 3\r4 : x=3 : 2.4 0x -- x = 0\r8 16 8\r4b\r3 , ¡r5. 024. 82 ^p0tuvw\r(1)\r2\r(2) `xC^80%y45^ºu5 , L{xCtuvw MR\rM1R L©XZ[\]*^_`\r6 cm~~-