有一根长2.5米，横截面面积是4平方分米的钢材．如果这种钢材每立方米重7.8吨，这根钢材重多少吨？合多少千克？
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直接写出得数×3=×16=×=（+）×4=×+×=+=÷3= 4÷=
×1= 52﹣42= 0.75﹣0.5=×=÷= 125×0.08= 0.5+0.02=÷=÷= 0.15×6= 12÷0.3= 0÷=
直接写得数．×16= 12÷= 24×=×÷= 1÷=÷15=÷=×÷×=
口算我最棒= 26×======= 6.4÷20%= 125%×8=
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×3=
×16=
×
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+
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×
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×
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÷3= 4÷
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×1= 52﹣42= 0.75﹣0.5=
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= 125×0.08=
÷
= 0.15×6= 12÷0.3= 0÷
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×16= 12÷
= 24×
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×
÷
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÷15=
÷
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×
÷
= 26×
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= 6.4÷20%= 125%×8=