小明到商店买了相同数量的红球和白球,红球原价2元3个,白球原价3元5个.新年优惠,两种球都按1元2个卖,结果小明少花了8元钱.问,小明共买了多少个球?
17.5×0.65+0.175×25+1.75.
计算:19.58×66+22×91.26= . 64×12.5×0.25×0.05= .
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=