数学简便运算:4.2×4.2+0.42×58

问题描述:

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+58)=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+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