Question

2.5X0.7+5X0.12+7.5X0.02的简便方法？

2.5X0.7+5X0.12+7.5X0.02的简便方法

Answer 1

巧算2.5×0.7+5×0.12+7.5×0.02
解题思路:四则运算规则(按顺序计算,先算乘除后算加减,有括号先算括号,有乘方先算乘方)即脱式运算(递等式计算)需在该原则前提下进行

解题过程:
2.5×0.7+5×0.12+7.5×0.02

=2.5×(0.7+2×0.12+3×0.02)

=2.5×(0.7+0.24+0.06)

=2.5×1

=2.5

扩展资料→竖式计算-计算过程:两个加数的个位对齐,再分别在相同计数单位上的数相加,相加结果满10则向高位进1,高位相加需要累加低位进1的结果。

解题过程:
步骤一:0+4=4

步骤二:7+2=9

根据以上计算步骤组合计算结果为94

存疑请追问,满意请采纳

Answer 2

2.5X0.7+5X0.12+7.5X0.02简便计算方法

=2.5×0.7+2.5×0.24+2.5×0.06

=2.5×(0.7+0.24+0.06)

=2.5×1

=2.5

Answer 3

2.5×0.7+5×0.12+7.5×0.02
＝（2.5×0.7+5×0.12+7.5×0.02）×2÷2
＝（2.5×0.7×2+5×0.12×2+7.5×0.02×2）÷2
＝（3.5+1.2+0.3）÷2
＝5÷2
＝2.5

Answer 4

2.5×0.7+5×0.12+7.5×0.02
＝5×0.5×0.7+5×0.12+5×1.5×0.02
＝5×0.35+5×0.12+5×0.03
＝5×（0.35+0.12+0.03）
＝5×0.5
＝2.5

Answer 5

5x0.5x0.7+5x0.12+5x1.5x0.02
=5/100x(5x7+12+1.5x2)
=5/100x(35+12+3)
=5/100x50
=250/100
=2.5