先估计商是多少,再计算.682÷11 737÷41 420÷49990÷15 716÷12 445÷89.
直接写得数.+= ÷6= ×= 2﹣+=×16= 6﹣= ÷= 5×÷5×=
直接写得数.= == == 75%÷25%== =
= = = == = = == = = =
直接写出得数.+0.2= +﹣0.2= 5÷= ×1.5+3=3.6×= ×1.5= ﹣= 1﹣137.5%=
直接写得数﹣= ÷9= 1﹣= ×=÷= ÷= += ×=+= ÷= ﹣= ×=