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1 2 . 3 1. . 2. . 45100X250 100+X=250X=1506 . . 7X9x+3=98xx + 3 = 9 x=- 3- 36 ：x+3=9 . 9X+3=9 X+3-3=9-3X=3 =X+3 =6+3 =9 = X=6 .x=6 : :103x = 18xxx3x（ ）=18（ ）33x= 6:11 3x = 18 3X3=183 x=6 =x3 =63 =18 =x=6x=6 : .:12X2.4=6X1.1=3 : 13X2.4=6X1.1=3X 2.4+2.4=6+2.4X=8.4=8.42.4 =X 2.4=6X=8.4X1.11.1=31.1X=3.3=X1.1=3.31.1=3=X=3: :14- !15X 1.2=4X 1.21.2=4 1.2X =2.8 = X 1.2= 2.8 1.2=4=X=2.83X=8.4X=2.83X3=8.43= 3X = 3 2.8=8.4=X=2.8 : : : 16( )X+3.2=4.6 X-1.8=41.6X=6.4 X3=2.117 18 - 19
