题一:(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0
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题一:
(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
提示:A=0.23+0.34
B=0.23+0.34+0.65
原式是什么?
题二:
一个长方体表面积是66.16平方厘米,底面积是19平方厘米,底面周长是17.6厘米.这个长方体的体积是多少?
(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
提示:A=0.23+0.34
B=0.23+0.34+0.65
原式是什么?
题二:
一个长方体表面积是66.16平方厘米,底面积是19平方厘米,底面周长是17.6厘米.这个长方体的体积是多少?
(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0.34)
=(1+A)*B-(1+B)A=B+A*B-A-B*A=B-A
设长=a 宽=b 高=h
有:2ab+2ah+2bh=66.16
ab=19
2(a+b)=17.6
自己解咯
=(1+A)*B-(1+B)A=B+A*B-A-B*A=B-A
设长=a 宽=b 高=h
有:2ab+2ah+2bh=66.16
ab=19
2(a+b)=17.6
自己解咯
题一:(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0
1.(1十0.23十0.34)*(0.23十0.34十0.56)一(1十0.23十0.34十0.56)*(0.23十0.
(1+0.23+0.34)×(0.23+0.34+0.65)-(1+0.23+0.34+0.65)×(0.23+0.34
简便计算(1+023+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23+0
简便计算:(1+0.23+0.34)*(0.23+0.34+0.65)-(1+0.23+0.34+0.65)*(0.23
(1+0.23+0.34)×(0.23+0.34+0.56)-(1+0.23+0.34+0.56)×(0.23+0.34
3.4(猜一成语) 0.23(猜一成语)7÷8(猜一成语)
1枝圆珠笔比一枝铅笔贵0.23元,一枝钢笔又比一支圆珠笔贵1.2元,1枝钢笔比一支铅笔贵多少元?
(1+0.23+0.34)*(0.23+034+0.56)-(1+0.23+0.34+0.56)*(0.23+0.34)
(1+0.12+0.23)×(0.12+0.23+0.34)-(1+0.12+0.23+0.34)×(0.12+0.23
﹙1+0.23+0.34﹚×﹙0.23+0.34+0.56)-﹙1+0.23+0.34+0.56﹚×﹙0.23+0.34
计算:(1+0.23+0.34)*(0.2903+0.34+0.56)-(1+0.23+0.34+0.56)*(0.23