《有理數(shù)減法》有理數(shù)PPT課件2
你來練一練:
50 – 20 = 50+(-20)=
50 – 10 = 50+(-10)=
50 – 0 = 50 + 0 =
50 – (-10)= 50+(+10)=
50 – (-20) = 50+(+20)=
計算
(1) (-32) – (+5)
(2) 7.3 - (-6.8)
(3) (-2) – (-5)
(4) 12 – 21
(5) (-51) + (-2.2) – (-10.8)
... ... ...
你會做嗎?
1. 下列括號內(nèi)各應(yīng)填什么數(shù)?
(1)(-2)-(-3)=(-2)+( );
(2) 0 - (-4)= 0 +( );
(3)(-6)- 3 =(-6)+( );
(4) 1-(+39)= 1 +( )
2. 計算:
(1)(+3)-(-2); (2)(-1)-(+2);
(3) 0 -(-3); (4) 1 - 5;
(5)(-23.6)-(-12.4);
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