单元练习 1.7/8;21;32;87.5% 2.9;400;69 3.92% 4.<>>< 5.10%;九二折 6.250 7.40%;37.5% 8.90% 9.60 10. 6二、1.√ 2. ╳ 3. ╳ 4. ╳ 5. ╳三、1. 45% 1.52 0.1 2 30 20 2. 0.035 0.35% 0.0025 66.7% 62.5% 144.4% 0.06 175%0.04 3.解:145%x=14.5 解:45%x=13.5 x=14.5÷145% x=30 x=10 解:104%x=0.26 解:3x+3.6=9 x=0.26÷104% 3x=5.4 x=0.25 x=5.4÷3 x=1.84.=7×9/7+7/9×1/7 =24÷0.4×8/5 =2/7×1/5+1/7 =9+1/9 =60×8/5 =2/35+1/7 =82/9 =96 =1/5 =8/9÷(2/3×4/3) =8/17×1/23+1/23×9/17 =3/4÷(56×3/56) =8/9÷8/9 =1/23×(8/17+9/17) =3/4÷3 =1 =1/23×1 =1/4 =1/23 =5/8×1/27×8+19/24 =35×8/7×1-2/7 =5/24+19/24 =278/7 =1四、1. (50-45)÷50=10% 答:三月份用水比二月份节约10%。2. 280×30%=84(万元) 答:这家化妆品厂去年应缴纳消费税84万元。3. 解:设白兔有x只。 (1+20%)x=504 120%x=504 x=504÷120% |