國1的數學題目及一些重點..各位大大幫幫
可以告訴我怎麼算嘛?
或是怎樣去理解 ?
請下面五提各位大大幫我..列出算法 .. !! 3Q
1. 54×9÷(-2)+(-17)=
2. 23-(-1)x59÷(-59)=
3.(-58)+8=
4.25x(-19)x(-8)=
5.{3x(-5)-(-5)x13}x4÷25=
正正得正
負正得負
正負得負
這些國中我記得有要背喔!!!
1. 54×9÷(-2)+(-17)
= 486÷(-2)+(-17)
=(-241)+(-17)
=-257
2. 23-(-1)x59÷(-59)
=23-(-59)÷(-59)
=23-(-1)
=23+1=24
3.(-58)+8= -50
4.25x(-19)x(-8)=(-475)x (-8)
=475×8=3800
5.{3x(-5)-(-5)x13}x4÷25
={(-15)-(-5)x13}x4÷25
=(-10)x13x4÷25
=(-130)x4÷25
=(-520)÷25
=20.8
=(-243)+(-17)
=(-260)
2.=23-(-59)÷(-59)
=23-1
=22
3.=(-50)
4.=(-475)x(-8)
=3800
5.=[(-15)-(-65)]x4÷25
=50×4÷25
=200÷25
=8
以上五題是照著基本的先乘除後加減做出來的
老實說我很說,你自己的功課應該自己做才對的
但是我猜你可能是懶的算,所以才會花點數來問問題的
2.負負得正 正負得負 負正得負 正正得正
3.去按計算機
在這邊講答案 對你就沒意義了
2. 22
3. -50
4. 3800
5. 8
負負得正
正正得正
負正得負
正負得負
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