1、- = - + + =- + + + 2 = 1 - = = = = = = = = 1= = = = = = = = = = = = = = = 7= += =+= = 5= 5- = 1-=+= += 2 += 0.25= = += += += += -= 0.74+= 0.375+ 1 + = 1= = + = = =+ = 1 = + = - = = = + + 1=- = + = + = + = += = 1 5= 5=2=8= 80.4 4= 7-6.38 360.9 = 50.001 = 130.02 = 0.36+1.54 1355 3.5= 26= 4.576.43= 54=
2、 99 4.3-1.6= 7= 0.6+7= 0.5 8=100= 125= 3.21.78 四、计算下面各题,能简算的要简算。327.5(2.53.8) 55 125-10 10-4.8-3.2 0.17 1.7 101 27+733.25 1.41.8 493.2 788.5220.5 15-512- + - = - + =+ - + ) 0.25+ + + + 10- () () () 6()- (+ ) + + - + 25 - - + - - (- ) 5 +()() () 2 + 11= = + + +=() 3 - - - 12 1557 131 1.8750.25= = = =
3、1= 4() 2- - 0.8+0.2 ( ) ()23(- ) 6() 4.8+ -(- ) + -(+ )+ - + + ()()1 + + +- () () ()5() 3(+) () 2= () () 10() + + = (+)() ()+()解方程 2x+4.625 + x = X= X += x = x + = =X=+ x = x +( + )=2 x+0.75- 0.15 x16 = 35 0.5+4.5x=45.5 X4.5 = 20 5x3x= 3.2 5.5X-3X15 X=2X=1- 3x29 =19X1.6 = 38.9 x=x - = = X 4x - =2- 89.122.9 3x142 11 8X5=0.25 3.8x-0.8x=27 -xx= x - x= X326x = 4.2