3/4-1/2=?8×(3/4-1/2)=?15×7/25-4/5=?36×7/12+5/12=?
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3/4-1/2=?8×(3/4-1/2)=?15×7/25-4/5=?36×7/12+5/12=?
写对再奖悬赏分!
写对再奖悬赏分!
![3/4-1/2=?8×(3/4-1/2)=?15×7/25-4/5=?36×7/12+5/12=?](/uploads/image/z/18482965-61-5.jpg?t=3%2F4-1%2F2%3D%3F8%C3%97%EF%BC%883%2F4-1%2F2%EF%BC%89%3D%3F15%C3%977%2F25-4%2F5%3D%3F36%C3%977%2F12%2B5%2F12%3D%3F)
1/4
2
17/5
257/12
2
17/5
257/12
用简便方法计算.5/12+7/15+8/15+7/12=、1--3/7--2/7=、3/4+8/14--1/4--1/1
(1)4:8=x:25 (2)x:5分之4=2分之15:3分之8 (3)x分之12=7.5 (4 )5分之80=7分之x
数学趣味规律题:1-3=12 4-9=39 7-5=36 2-8=?
计算(1)(-10)+(+6)=-(10-6)=-4(2)(+12)+(-4)=+(12-4)=8(3)(-5)+(-7
1/5+2/7+5/8+1/6+2/7+5/9-4/7+2/5+1/7+3/8-12/15+14/17=?
拖式:4/5*(-25/3)*(-7/10)= (7/12-5/6+1)*(-24)= [1/5+(-1/2)+(-5/
解方程:x-12/5=4/1 15/7+x=5/4 x-2/1=3/1
有一个算式塔如下:1+2+3=4+5-36+7+8+9=10+11+12-313+14+15+16+17=18+19+2
已知十组数据,x=(1,2,3,4,5,6,7,8,9,10)y=(12,23,25,34,62,52,41,15,67
2/5+3/7+2/9+5/7+3/5+11/15+12/17+1/9+2/5+4/7+3/8=?
1-57×21/25= 1/2+5/4×4/5= 1/6×(5-2/3)= 7/8×7+3/8=
3/4-7/12+5/18= 3/25+x= 8/15 0.39+1/5+39/100+4/5= 8/19-6/19+1