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1、计算:加、减、乘、除138+17 230199 61.92.1 8.9+3.8+1.1=0.4+0.06 1.60.06 0.654.35 18.20.283.50.2 1.2580 0.2610 2.45136 173 143 1.93818181 6486 36366 4.20.071.47 0.960.3 3.61.2= 0.50.25=0 229 1 1010 15 0.2514+ 45 91 ()0.23+177%= 812.5%= 3+20= 200( )84025% = 0= = 02581 0=10.5 101 32:16 0.125:0.3 ( ): ( ): ( ): (
2、): 254 1258 2005 2450.1 0.2 0.3 0.4 0.56 7 8 9 10 2 3 4 56 7 8 9 101 2 3 4 56 7 8 9 101 2 3 4 5 6二、能简算的要简算0.66+7.5+0.34+2.5 8+8+82.5835070 (+)616.57.31.41.3 2.9+385354.336() 0.211 + 0.7511 168.1(4.320.4)5.89+3.60.20.28 36() ()12 3-(+) 1()563999 12532 10185 4657.54.2515.75 5+ 101三、求未知数的值。+1630 :0.5=3:x = =3.4 :=:4 = +4=10 : =:8 = 5.5x3x = 1.75 = 15X = 2X = : =:15 1.75 :42:105.5x3x = 1.75 (1)X = 5.5506.4