问题
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:1,1,8,16,7,21,4,16,2,()。A.10 B.20 C.30 D.40
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1, 1, 8, 16, 7, 21, 4, 16, 2, ()A.10 B.20 C.30 D.40
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1,1,8,16,7,21,4,16,2,()。A.10 B.20 C.30 D.40
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看谁算的块。(1)40×7=(2)400×7=(3)24×20=(4)24×200=(5)18×4=(6)18×40=(7)30×80=(8)300×80=
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用简便方法计算.0.3×2.5×0.40.78×1012.5×(8+0.4)1.25×0.7×0.89.8×2.550.8×101-50.84.6×99+4.60.25×32×0.125
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简算:0.25×4.78×40.65×2011.2×2.5+0.8×2.54.8×0.256.53÷0.4÷2.51.8×20.1.