画一个比∠1大40°的角和比∠1小10°的角,并标出是什么角.
2.89×4.68+4.68×6.11+4.68.
1+12.7+5.9+17.3 270﹣42.5﹣17.5 125×88 130÷25÷425×32×125 125×103﹣125×3 22.4×25﹣25×2.4.
直接写出得数:0.4×0.25= 7.8×9.9= 0.5×3.81×2=56.42÷7= 0.8÷0.01= 9.3÷6÷0.5=
计算.(能简算的要写出简算过程)①4.52+0.61+1.39+6.48 ②4.27﹣(1.96﹣1.73)③(294.4﹣19.2×6)÷(6+8)④12.5×0.76×0.4×8×2.5.
用你喜欢的方法计算下面各题99×4.2+4.2 0.25×1.25×3.26.4×14+15×6.4+6.4 (1.3+1.3×0.125×8)÷(80﹣77.4)4×(25+2.5+0.25)÷111 6.25÷〔(17.2﹣3.6×4.5)÷0.32〕