4.2乘6.9加0.42要简便的

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4.2乘6.9加0.42要简便的4.2乘6.9加0.42要简便的4.2乘6.9加0.42要简便的4.2乘6.9加0.42=0.42x69+0.42=0.42x(69+1)=0.42x70=29.44.

4.2乘6.9加0.42要简便的
4.2乘6.9加0.42要简便的

4.2乘6.9加0.42要简便的
4.2乘6.9加0.42
=0.42x69+0.42
=0.42x(69+1)
=0.42x70
=29.4

4.2x6.9+0.42=29.4

4.2乘6.9加0.42
=0.42x69+0.42
=0.42x(69+1)
=0.42x70
=29.4

4.2x6.9+0.42
=4.2x6.9+0.42x1
=4.2x6.9+4.2x0.1
=4.2x(6.9+0.1)
=4.2x7
=29.4