1.(+15)+(-20)+(+28)+(-10)+(-5)+(-7) 2.(+2又3/4)+(-1又5/8)+(-5/6)+1/2 3.(-3又1/2)+(-2又1/9)+3.5+(-8/9)+1/2 4.(-1)+(+2)+(-3)+(+4)+.+(-41)+(+42)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 19:31:11
![1.(+15)+(-20)+(+28)+(-10)+(-5)+(-7) 2.(+2又3/4)+(-1又5/8)+(-5/6)+1/2 3.(-3又1/2)+(-2又1/9)+3.5+(-8/9)+1/2 4.(-1)+(+2)+(-3)+(+4)+.+(-41)+(+42)](/uploads/image/z/5506967-47-7.jpg?t=1.%EF%BC%88%2B15%EF%BC%89%2B%EF%BC%88-20%EF%BC%89%2B%EF%BC%88%2B28%EF%BC%89%2B%EF%BC%88-10%EF%BC%89%2B%EF%BC%88-5%EF%BC%89%2B%EF%BC%88-7%EF%BC%89+2.%EF%BC%88%2B2%E5%8F%883%2F4%EF%BC%89%2B%EF%BC%88-1%E5%8F%885%2F8%EF%BC%89%2B%EF%BC%88-5%2F6%EF%BC%89%2B1%2F2+3.%EF%BC%88-3%E5%8F%881%2F2%EF%BC%89%2B%EF%BC%88-2%E5%8F%881%2F9%EF%BC%89%2B3.5%2B%EF%BC%88-8%2F9%EF%BC%89%2B1%2F2+4.%EF%BC%88-1%EF%BC%89%2B%EF%BC%88%2B2%EF%BC%89%2B%EF%BC%88-3%EF%BC%89%2B%EF%BC%88%2B4%EF%BC%89%2B.%2B%EF%BC%88-41%EF%BC%89%2B%EF%BC%88%2B42%EF%BC%89)
1.(+15)+(-20)+(+28)+(-10)+(-5)+(-7) 2.(+2又3/4)+(-1又5/8)+(-5/6)+1/2 3.(-3又1/2)+(-2又1/9)+3.5+(-8/9)+1/2 4.(-1)+(+2)+(-3)+(+4)+.+(-41)+(+42)
1.(+15)+(-20)+(+28)+(-10)+(-5)+(-7) 2.(+2又3/4)+(-1又5/8)+(-5/6)+1/2 3.(-3又1/2)+(-2又1/9)+3.5+(-8/9)+1/2 4.(-1)+(+2)+(-3)+(+4)+.+(-41)+(+42)
1.(+15)+(-20)+(+28)+(-10)+(-5)+(-7) 2.(+2又3/4)+(-1又5/8)+(-5/6)+1/2 3.(-3又1/2)+(-2又1/9)+3.5+(-8/9)+1/2 4.(-1)+(+2)+(-3)+(+4)+.+(-41)+(+42)
1 [(+15)+(-10)+(-5)]+[(-20+(-7)+(+28)]=28-27=1
2.11/4-13/8-5/6+1/2=(66-39-20+12)/24=19/24.
3.(-7/2)+3.5+(-11/9)+(-8/9)+1/2=1/2-19/9=-29/9.
4.(42-41)+(40-39)+...+(2-1)=20
15、28、43、()、79
15,28,54,( ),210
15-[-1-(-20-4)] -40-28-(-19)+(-24)
(5)15-[-1-(-20-4)] (6) -40-28-(-19)+(-24) 求过程
( ):15=20:( )=4:5=28:( ) 括号里应添什么数?
1.(+15)+(-20)+(+28)+(-10)+(-5)+(-7) 2.(+2又3/4)+(-1又5/8)+(-5/6)+1/2 3.(-3又1/2)+(-2又1/9)+3.5+(-8/9)+1/2 4.(-1)+(+2)+(-3)+(+4)+.+(-41)+(+42)
七年级简便计算 要过程和结果1.(+15)+(-20)+(+28)+(-10)+(-5)+(-7)2.(+2又3/4)+(-1又5/8)+(-5/6)+1/23.(-3又1/2)+(-2又1/9)+3.5+(-8/9)+1/24.(-1)+(+2)+(-3)+(+4)+.+(-41)+(+4
15-[1-(-20-4)] (-40)-28-(-19)+(-24)22.54+(-4.4)+(-12.54)+4.4 (2/3-1/2)-(1/3-5/6)过程
42分之24等于28分之15加() 20分之12等于30分之15加()
15分之5的最大公因数最大公因数(811)( 4 8)( 5 6)( 24 20)( 15 5)( 21 7) (3 6) (9 28)
(9 12)(12 16)(14 21)(24 32)(15 35)(28 49) (19 16)(15 3)(20 16 (28 14)(16 24) (42 48) (28 21) (27 36) (36 42) (32 56) (14 35)求上面这些的最大公因数
12和13(4,16)(84,28)(15,20,30)的最小公倍数以及最小公约数
找规律 填数 17,18,13; 28,(),19; 15,13,20
三下数学补充习题32页的第一题 (1)25×18=25×2×9=50×9=45015×18=15×2×( )=( )×( )=( )35×14=35×( )×( )=( )×( )=( )45×16=( )×( )×( )=( )×( )=( )(2)28×21=28×20+28
28减( )除以4等于20
计算下列算式 1.(-12)-(-18)+(-7)-(+15) 73+(-219)-(+81)73+(-219)-(+81)-4.5+(-2.6)-(-7)-(-21)+(-13)-(-25)-(+28)-442-23-(-31)+(-29)
51×14×20)+(28×6×17)=?
20、1、15、2、10、3、()、()、()、()