计算题(1)2222×0.17+33.33×4+666.6×0.9(2)1.4477÷0.0031-19.816×10.25+36.114
求x的值:5:x=1.
计算 1.25﹣(+)×80%
计算:6×﹣5×.
解方程: 2+1.8﹣5ⅹ=3.6 2ⅹ÷2.3=4.5 0.2(5x﹣1)+5(x﹣1)="0.8" 7(ⅹ﹣1.2)=2.1.
简算 4.9+0.1﹣4.9+0.1 10.78﹣(2.78+3.693) 99.99×22.22+33.33×33.34 (2.5×2.5+2.5×2.5+2.5×2.5+2.5×2.5)×8.