Question

2.25*9.3+6.75*2.9+4.5这道题怎么简便计算

Answer 1

巧算2.25×9.3+6.75×2.9+4.5
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:
2.25×9.3+6.75×2.9+4.5

=(0.5×9.3+1.5×2.9+1）×4.5

=（4.65+4.35+1)×4.5

=10×4.5

=45

扩展资料\竖式计算-计算结果: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:
步骤一:0.65+0.35=0.0 向高位进1 小数部分加法计算

步骤二:4+4+1=9

根据以上计算步骤组合计算结果为9

存疑请追问,满意请采纳

Answer 2

2.25*9.3+6.75*2.9+4.5这道题怎么简便计算
2.25*9.3+6.75*2.9+4.5
=0.001x(25x9x93+25x27x29+25x180)
=0.001x25x9x(93+87+20)
=0.001x25x9x200
=0.001x5000x9
=45

Answer 3

2.25×9.3+6.75×2.9+4.5
=2.25×3×3.1+6.75×2.9+4.5
=6.75×3.1+6.75×2.9+4.5
=6.75×（3.1+2.9）+4.5
=6.75×6+4.5
=40.5+4.5
=45