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有理数计算100道带过程

1. 2100-21*53+2255 2. (103-336÷21)*15 3. 800-(2000-9600÷8) 4. 40*48-(1472+328)÷5 5. (488+344)÷(202-194) 6. 2940÷28+136*7 7. 605*(500-494)-1898 8. (2886+6618)÷(400-346) 9. 9125-(182+35*22) 10. (154-76)*(38+49) 11. 3800-136*9-

39+[-23]+0+[-16]= 0 [-18]+29+[-52]+60= 19 [-3]+[-2]+[-1]+0+1+2= -3 [-301]+125+301+[-75]= 50 [-1]+[-1/2]+3/4+[-1/4]= -1 [-7/2]+5/6+[-0.5]+4/5+19/6= 1.25 [-26.54]+[-6.14]+18.54+6.14= -8 1.125+[-17/5]+[-1/8]+[-0.6]= -3 有理数的加减混合运算 1) (-9)-(

[-|98|+76+(-87)]*23[56+(-75)-(7)]-(8+4+3) 5+21*8/2-6-59 68/21-8-11*8+61 -2/9-7/9-56 4.6-(-3/4+1.6-4-3/4) 1/2+3+5/6-7/12 [2/3-4-1/4*(-0.4)]/1/3+2 22+(-4)+(-2)+4*3 -2*8-8*1/2+8/1/8 (2/3+1/2)/(-1/12)*(-12) (-28)/(-6+4)+(-1) 2/(-2)+0/7-(-8)*(-2) (1/4-5/6+

优质解答(1) (-9)-(-13)+(-20)+(-2) (2) 3+13-(-7)/6(3) (-2)-8-14-13(4) (-7)*(-1)/7+8(5) (-11)*4-(-18)/18(6) 4+(-11)-1/(-3)(7) (-17)-6-16/(-18)(8) 5/7+(-1)-(-8)(9) (-1)*(-1)+15+1(10) 3-(-5)*3/(-15)(11) 6*(-14)-(-14)+(-13)(12) (-15)*(-13)-(-17)-(-4)(13) (-20)/13/

一、教学目标1.使学生理解有理数的加减法可以互相转化,并了解代数和概念;2.使学生熟练地进行有理数的加减混合运算;3.培养学生的运算能力.二、教学重点和难点重点:准确迅速地进行有理数的加减混合运算.难点:减法直接转化为加法及

(1)(-9)-(-13) (-20) (-2)(2)3 13-(-7)/6(3)(-2)-8-14-13(4)(-7)*(-1)/7 8(5)(-11)*4-(-18)/18(6)4 (-11)-1/(-3)(7)(-17)-6-16/(-18)(8)5/7 (-1)-(-8)(9)(-1)*(-1) 15 1(10)3-(-5)*3/(-15)(11)6*(-14)-(-14) (-13)(12)(-15)*(-13)-(-17)-(-4)(13)(-20)/13/(-7) 11(14)8 (-1)/7 (-4)(15)(

0,1/5,-20/32/7(3X+7)=2-1.5X 7X-5/4=3/83-X/2=X+4/3 1/2-7=9X-2/65X-1/8=7/4 2X+1/3-5X-1/6=1 X-(X-1)/2=2-3X+2/3 X/2-7X+1/4=1 答案,3,-3,4/5,-3/5,13/14

(一)计算题: (1)23 (-73) (2)(-84) (-49) (3)7 (-2.04) (4)4.23 (-7.57) (5)(-7/3) (-7/6) (6)9/4 (-3/2) (7)3.75 (2.25) 5/4 (8)-3.75 ( 5/4) (-1.5) (9)( 1.3)-( 17/7) (10)(-2)-( 2/3) (11)|(-7.2)-(-6.3) (1.1)| (12)|(-5/4)-(-3/4)|-|1-5/4-|-3/4|) (13)(-4)( 6)(-7) (14)(-27)(-

1,x-y=2 xy=15 (x=5,y=3) 2,x+y=6 x-y=2 (4,2) 3,x+y=11,xy=30 (x=5,y=6,x=6,y=5) 4,x+y=13,xy=42 (x=6,7,y=7,6) 5,x+y=11,x-y=1 (x=6,y=5) 6,x+y=12,xy=35 (x=5,7,y=7,5) 7,x+y=5,xy=6 (x=2,3,y=3,2) 8,x-y=5,xy=36 (x=6,y=1) 9,x+y=10,xy=25 (x=y=5) 10,x+y=

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