数学简便运算：4.2×4.2+0.42×58
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数学简便运算：4.2×4.2+0.42×58数学简便运算：4.2×4.2+0.42×58数学简便运算：4.2×4.2+0.42×584.2×4.2+0.42×58=4.2×4.2+4.2×5.8=4.
数学简便运算：4.2×4.2+0.42×58
数学简便运算：4.2×4.2+0.42×58
数学简便运算：4.2×4.2+0.42×58
4.2×4.2+0.42×58
=4.2×4.2+4.2×5.8
=4.2×（4.2+5.8）
=4.2×10
=42
4.2×4.2+0.42×58
=0.42×42+0.42×58
=0.42×（42+58）
=0.42×100
=42
4.2×4.2+0.42×58
=4.2*4.2+4.2*5.8
=4.2*(4.2+5.8)
=4.2*10
=42
4.2×4.2+0.42×58＝4.2×4.2+4.2×5.8=4.2×(4.2+5.8)=42
原式=4.2x4.2+4.2x5.8=4.2x（4.2+5.8）=42
4.2×4.2+0.42×58=0.42（42+58）=42