（河北区）一根圆柱体钢材长2米，它的横截面直径是4厘米，如果每立方厘米钢重7.8千克，这根钢材大约重多少千克？（结果保留一位小数）
直接写出得数 8÷0.2= 2﹣1=×1= 1÷7+=+= 1.02﹣0.43=÷25%×=×2÷×2=
直接写得数． 33×=×4÷×4= 3.7+3.7×9= 1.6﹣= 16×25%= 5÷×0.7=×1=+﹣+= 11﹣﹣=（+）×24=
直接写得数： 3﹣0.07=×= 7.2÷0.8×9= 0.42= 1÷0.01%==
直接写出得数．+= 10﹣5.75= 7÷0.01=×= 1.7×5.4×0= 54+49+46= 6298÷70=（+）×30= 1×（﹣1÷3）=﹣×=
直接写出得数． ①2﹣= ②0.1÷0.01= ③×=④+= ⑤127+28= ⑥1÷7+= ⑦1.8×0.3= ⑧2.9+4.5= ⑨×2÷×2= ⑩0.25×99+0.25= ．
=
×1
= 1÷7+
+
= 1.02﹣0.43=
÷25%×
=
×2÷
=
×4÷
=
×0.7=
×1
=
+
﹣
=
﹣
﹣
=（
+
）×24=
×
= 7.2÷0.8×9=
=
+
= 10﹣5.75= 7÷0.01=
×
= 1.7×5.4×0=
+
﹣1÷3）=
﹣
= ②0.1÷0.01= ③
×
=④
+
=
= ⑦1.8×0.3= ⑧2.9+4.5=
×2÷
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