一种钢材米重吨,求1吨钢材长多少米?
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用竖式计算.428×7= 290×5=
请直接写出得数.1.7×0.03= 0.16×0.5= 4.5×0.03= 5.2÷13=0.7×1.1= 9.6÷0.6= 0÷3.68= 2.5×8=
巧妙估算.302×8 61×4 79×6 292×7415×4 395×6 9×813 6×597
计算.420×2= 201×4= 107×5= 136×5= 266×2= 560×7=