1、解方程。4851x4.2%156.3x735087x1.532.4%0x30x642.9x=0.81.2 1 X= 2.5X = 6 :60X6287:159X+50%X=7.5 2X = 2 =x: 2x3.571.43=10 8-3.5=1855 = 40=0.75 35%=5.2 60% =1.2 16 -6.4 =365218xx=x.40.81279x3197.23 x82.7794380.36524 5.4X2.6X=840 8X = : X2.1: 2.3. 9178 815X:12= :3 : =X : = X:12 = :2.8 X0.48470112083414x 2= 0
2、.5 = X402.54 = 20 3 4X +30.9 = 24.7851.8x.4X6X3.72.20 = X X3.25 = + 7323 14 35 15 54 0.5X 30.8 12X 13X 120计算下面各题,能简算的要简算。36015-2.51.6 ( )(2 ) - 13 ( - ) 481112 34 12 51348396543913.698360.2 0.253.21.25 18.15(3.5-1.75)1534265639.57(2.573.38)2.62 12( ) 1- - - - 6 - 614214863115.62.615.62.4 5600258 4.9
3、6(1.32.96) 1 2477.28-(1.25+0.28) 4.581.251.25 9990200.8+2008153836 150.250.25 51042( ) 0.8412.52.514 5637( + ) 108027018864 7.54 2.46 2.512.5400.8 15 2315 113 2176(2.4 )0.625 40.5 (1 )1.2 18( )205445313.62.87.47.2 23 ( ) ( +40%) -17823179213518726751( )12 0.75 (1- 7) 20.2810.20.1251259540427%2.5 ( ) 9 6.82.52.53.2 5.7-(1.9-1.3)1425 75 1425 78 78( ) ( ) ( )34 34 56 32 56 25 13 57 4152013543 3 ( )12 0.8614% ( ) 74712 127 0.625(8.32.512%) 3 3 ( ) 24( )730935414 18 16 ( ) 48 37 4.899+4.8 351721038541727 613 274.520.740.26 (2.52.560%)4 3 7215 1315 13