1、 有理数加减法口算百题23= 0(1)= +96= (34)+(+89)= 21(+4)= 7090= 5(+6)= 189= (+56)(+73 )= 12(+9 )= (6)+8= 20+(+7)= (12)( 9)= 6+9= +3(54)= 3+(+7)= 9(1/4)= 3.28= 6688= 66(+88)= 66+88= (36)7= (36)(7)= ( 36)+(+7)= 丨2 丨+(4)= (+7)(+8)= +9(7 )= +9(+7)= 2(+9)= 15(8)= 2(9)= 2+(+9 )= 2+9= 81+29= 2335= 4+6= 34= 8/916/15= 3
2、/4+2= 0.3+(2/3)= 1(+1.2)= 丨72 丨 ( 2)= +5(6)= 丨9+3 丨 = (+5)(+8)= 3+( )=7 丨6 丨+ ( )=9 ( )+(30)=40 ( )30=40 丨3 丨+ (3)= 6+ ( )=9 6( )=9 12=( )+(5) 2/9(+5)= +7+( )=2 0.2+ (+1/6)= ( )7=27 (35)(+35)= +35( 35)= 2 ( 4)= 6 丨3 丨= 25(+26)= 56= +8+(5)= 89= 2(5)= 78+6= 78+(+6)= 78+(6)= 78(+6 )= 890= 78(6)= +78+(+
3、6)= +78+(6) = +78(+6)= +78(6)= 9+7= 78 6= 78(6)= 4( )=1 4( )=1 ( )4=1 ( )(4)=1 ( )+(4)=1 40( )=1 8( 40)= 1(2)= 25= 25= 2+5= 3.6+(4)= 3.64= 3.6(4)= 3.6(4)= +3.6(4)= +3.6+(+4)= 9.2( )= 2.6 +2.3( )=5.4 2.3( )= 5.4 丨3 丨+丨3 丨=丨3 丨+ (3)= 22丨 3 丨= 丨3 丨+( 3.1)= ( 6)丨 3 丨= 812= 8( 12)= 8(+12)= 8+(12)= 8(12)= 8(+12)= 3067= 30+67= 4.5+2.7= 814= 8+( 14)= (8) (14)= 27= 07= 70= +72= 7+0= 72= 0+(- )=15(-2 )+(-1.3)= = 2 +(1 )= 5112376(-3 ) +( +7 )= ( )= ( ) =2112331212+34= 1+23+4= 8+(30)(6)= 2356= (+7)+(5)+(+2)= +6(+2) (9)+(4)= 注:/ 表示分数线