如图,圆O的面积与长方形的面积相等,图中的圆的周长是18.84厘米,求图中阴影部分的面积.
12.56﹣6.64﹣3.36 45.5﹣(0.98+5.5) 6+7.94+6.4 3.75×4.8+62.5×0.48.
123.4÷4÷25 48×25 5.8×101 1.2×25×4 46×6.8+6.8×54 99×7.9+7.9 101×0.38﹣0.38.
脱式计算,能简算的要简算.①67.5×0.52+3.25×5.2 ②36×(+) ③42÷(÷) ④3.5×[(702﹣270)÷16].
14.6×3.8﹣3.8×4.6 53+79+47+121 ×+× 2.5×(4+0.3)12×(+﹣) ×(+0.3) 956﹣5.8﹣4.2 68.6×28+31.4×28.
能简算就要简算10﹣2.65= 0.9×0.08= 528﹣349= 6+14.4=2.4÷0.04= 400÷125÷8= 19×4×0.5= 12.34﹣2.3=0÷3.8= 077+0.33= 675+0.25= 72÷8×4=5﹣1.4﹣1.6= 1125﹣997= (8700+870+87)÷87= 125×8.8=13+4.25+3.7+3.75=