7.9x6.74-(7.43-0.69)x7.9(简便)
0.64x9.9 3.14x99+3.14 0.45x7.5-0.45x6.5 0.25x3.5x4x2用简便计算怎么算
5.89x7.6+0.25x58.9-0.589简便计算
x8+x7+x6+x5+x4+x3+x2+x+1因式分解
99.9x7.78十33.3x6.66怎么简算
有整数x1,x2,x3,x4,x5,x6,x7.x1
1、5x6/1+6x7/1+7x8/1+8x9/1+9x10/1+……+19x20/1
2x2/1x3+4x4/3x5+6x6/5x7+8x8/7x9+10x10/9x11+12x12/11x13 仔细看看
计算:1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10.
3.52x0.79-0.173x7.9+1.79x0.21简便运算
5/17x9/27+9/17x7/24的简便运算
49十93X7怎简便计算
7分之2十7分之2x6十9分之3用简便方法做