笔算下面各题.带○的要验算.107×35= ○504÷42= 540×18= ○992÷31=
直接写得数4.3+3.57= 6.3÷0.9= 2.4×0.5= 1÷0.2÷0.5=5﹣﹣= 10÷10%= 1÷0.2÷0.5= 7×÷7×=
直接写得数24÷= ﹣= 10+2.52= (﹣0.5)×=×= (+)×12= ×÷×= 0.32×200=
计算下面各题.= = = =+= = = ==
口算:= = = = == = =
看图填空.
(1)红色+绿色=+=(2)黄色+黑色=+=(3)红色﹣黄色=﹣=(4)你还能提出什么数学问题?能解答吗?