=4.2x(7.8+2.2)
=4.2x10
=42本回答被网友采纳
如图
等于
4.2x(7.8+2.2)
等于
4.2x10
等于
42
=4.2×（7.8+2.2）
=4.2×10
=42
能简算的要简算 4.2x7.8十2.2x4.2
4.2x7.8十2.2x4.2 =4.2x(7.8+2.2)=4.2x10 =42
4.2x7.8+2.2x4.2简便计算
4.2x7.8+2.2x4.2简便计算方法如下：4.2x7.8+2.2x4.2 =(7.8+2.2)x4.2 =10x4.2 =42 解题思路：观察式子，发现两边都有4.2，因此可以把4.2提前出来，然后再进行计算，这样计算的优点是计算量小。
4.2×7.8+2.2x4.2用简便计算怎么写?
简算如下，4.2×7.8+2.2×4.2=4.2×（7.8+2.2）=4.2×10=42
4.2x7.8+2.2x4.2简便计算
4.2x7.8+2.2x4.2 =(7.8+2.2)*4.2 =10*4.2 =42
4.2×7.8+22×042怎么简便计算?
4.2×7.8+22×0.42 =4.2×7.8+2.2×4.2 =4.2×（7.8+2.2）=4.2×10 =42
4.2×7.8+2.2x4.2用简便计算怎么写
回答：(7.8+2.2)4.2=42
简便运算4.2×7.8+4.2×0.22
解：采用提取公因式的简便方法,原式=4.2x7.8+42x0.22 =4.2x7.8+4.2x2.2 =4.2x（7.8+2.2）=4.2x10 =42
4.2x7.8+2.2x42怎样简算
4.2x7.8+2.2x42 =4.2x7.8+2.2x4.2×10 =4.2x7.8+4.2×22 =4.2×（7.8+22）=4.2×29.8 =4.2×（30-0.2）=4.2×30-4.2×0.2 =126-0.84 =125.16
4.2x7.8十2.2x4.2怎样简便?
4.2×7.8+2.2×4.2 ＝4.2×（7.8+2.2）＝4.2×10 ＝42
4.2×7.8+2.2×4.2
回答：4.2乘7.8加2.2乘4.2 等于32.76加9.24 等于42
