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4.2.6

解:6-x=21÷4.2 6-ⅹ=5 ⅹ=6-5 x=1

4.2(6-x)=21 25.2-4.2x=21 4.2x=25.2-21 4.2x=4.2 x=1

4.2 6.5 8.8 11.1 13.4 ……这是个等差数列,两个相邻数之间都相差2.3

6-x=5 x=1 ~回答完毕~ ~结果仅供参考~ ~\(^o^)/~祝学习进步~~~

4.2:6分之1=4.2×6:1/6×6=25.2:1=25.2

6/7×4.2 =6/7×4又1/5 =6/7×21/5 =18/5 =3.6,

6×0.7=4.2 6.6×6.7=44.22 6.66×66.7=444.222 6.666×666.7=4444.2222 规律:若被乘数小数点右边有(n-1)个6,乘数小数点左边有(n-1)个6,(n=1,2,3,…)则积的小数点左边有n个4,积的小数点右边有n个2.

4.2*(6.2+2.8+1)=4.2*10=42

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