推荐回答(5个)
四则运算7.8×87.5+15.8×12.5
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:
7.8×87.5+15.8×12.5
=7.8×87.5+15.8×12.5
=682.5+197.5
=880
扩展资料=>计算过程:两个加数的个位对齐,再分别再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:
步骤一:0.5+0.5=0.0 向高位进1 小数部分加法计算
步骤二:2+7+1=0 向高位进1
步骤三:8+9+1=8 向高位进1
步骤四:6+1+1=8
根据以上计算步骤组合计算结果为880
存疑请追问,满意请采纳
简便方法,基本上需要观察运算律。本题有乘有加,所以最直观的就是乘法分配律。
观察到87.5+12.5=100
又因为7.8+8=15.8
所以可以把15.8×12.5=(7.8+8)×12.5=7.8×12.5+8×12.5
所以原来的式子=
7.8×87.5+15.8×12.5
=7.8×87.5+(7.8+8)×12.5
=7.8×87.5+7.8×12.5+8×12.5
=7.8×(87.5+12.5)+100
=780+100=880。
7.8x87.5+15.8x12.5
=7.8x87.5+7.8x12.5+8x12.5
=7.8x(87.5+12.5)+100
=7.8x100+100
=780+100
=880
以上就是简便计算过程。
2014-11-26
7.5÷12.5÷0.8
=7.5÷(12.5×0.8)
=7.5÷10
=0.75
10
更多回答(7)
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问答首页
解:7.8X(87.5十12.5)X100
二7.8X100X100
二78000
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