第一题根据乘法交换律简算: 2/3×1/4×3=2/3×3×1/4=2×1/4=1/2.。 第二题根据乘法分配律简算:= 8/9 ×27+7/24×27=24+63/8=24+7.875=31.875。希望对你有帮助。
(1)
2/3×1/4×3
=2/3×3×1/4
=2×1/4
=1/2
(2)
(8/9+7/24)×27
=8/9×27+7/24×27
=24+7/24×(24+3)
=24+7/24×24+7/24×3
=24+7+7/8
=31又7/8
2/3x1/4x3
=2/3x3x1/4
=2x1/4
=1/2
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(8/9+7/24)x27
=8/9x27+7/24x27
=24+7又7/8
=31又7/8
参考