作一个边长为4厘米等边三角形,再以该三角形一边的中点为圆心,以2厘米长为半径,作一个圆.
合理计算8.6×10.1 78.1﹣7.7÷0.7×5.2 〔(8.1﹣5.6)×0.9﹣1〕×0.48.25×4.08+0.75×4.08+4.08 1.25×32×2.5 8.1÷2+1.9÷2.
直接写得数12.7﹣(8.65+2.7) 92.5×0.25×4 6.7×0.9+6.7×0.18.25×9.9+0.825 3.4×8.7+34×0.13 6.5×1.1
简便计算12.5×(0.7×0.8) 6.25×1.02 1.25×9912.5×32×2.5 4.12﹣1.78﹣1.22 4.2÷0.7÷6.
0.46×7.5+0.46×2.53﹣7.14÷3.5×1.059.9×8.6+0.86[20﹣(90.75÷6.6+2.25)]×11.6.
7.02×900×0.60.035÷0.7÷0.513.6﹣13.6×0.75.62+3.1×0.6+3.38(25﹣1.25×5)÷2.58.1×0.3+1.8×0.3+0.03.