2.4x0.3+0.6x2.1的简便计算？
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2.4×0.3+0.6×2.1的简便计算过程如下：
2.4×0.3+0.6×2.1
=1.2×2×0.3+0.6×2.1
=1.2×0.6+0.6×2.1
=（1.2+2.1）×0.6
=3.3×0.6
=1.98
或者：
2.4×0.3+0.6×2.1
=2.4×0.3+0.3×2×2.1
=2.4×0.3+0.3×4.2
=（2.4+4.2）×0.3
=6.6×0.3
=1.88
2.4×0.3+0.6×2.1
=1.2×2×0.3+0.6×2.1
=1.2×0.6+0.6×2.1
=（1.2+2.1）×0.6
=3.3×0.6
=1.98
或者：
2.4×0.3+0.6×2.1
=2.4×0.3+0.3×2×2.1
=2.4×0.3+0.3×4.2
=（2.4+4.2）×0.3
=6.6×0.3
=1.88
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计算如下：
2.4×0.3+0.6×2.1
=1.2×0.6+0.6×2.1
=0.6×（1.2+2.1）
=0.6×3.3
=1.98
2.4×0.3+0.6×2.1
=1.2×0.6+0.6×2.1
=0.6×（1.2+2.1）
=0.6×3.3
=1.98
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2.4x0.3+0.6x2.1
=2.4x0.3+0.3*4.2
=0.3*（2.4+4.2）
=0.3*6.6
=0.3*6*1.1
=1.8*1.1
=1.8+0.18
=1.98
=2.4x0.3+0.3*4.2
=0.3*（2.4+4.2）
=0.3*6.6
=0.3*6*1.1
=1.8*1.1
=1.8+0.18
=1.98
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