1÷2+3÷2+5÷2+7÷2 = =

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1÷2+3÷2+5÷2+7÷2==1÷2+3÷2+5÷2+7÷2==1÷2+3÷2+5÷2+7÷2==(1+3+5+7)➗2811=0.5+1.5+2.5+3.5=86.50.5+1.5

1÷2+3÷2+5÷2+7÷2 = =
1÷2+3÷2+5÷2+7÷2 = =

1÷2+3÷2+5÷2+7÷2 = =
(1+3+5+7)➗2

8

11

=0.5+1.5+2.5+3.5=8

6.5

0.5+1.5+2.5+3.5=8

=16除以2
=8

=(1+3+5+7)÷2
=16÷2
=8
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用交换律

1÷2+3÷2+5÷2+7÷2 = = 366÷5x2+3÷2=? 5 5 5 5 5={1--10}在之间添符号,使之答案得1,2,3,4,5,6,7,8,9,10!(5+5)÷5-5÷5=1(5+5)÷5+5-5=2(5+5)÷5+5÷5=35+5-5÷5-5=45×5-5×5+5=55+5÷5-5+5=6(5÷5+5)+5÷5=7(5+5+5)÷5 (x+5)÷3-7=12÷2怎么解? 1.直接写出得数:× = ÷= + = - =+ = - = × = ÷ =- = + = 14 × = × =2.简便计算.(+ )÷ +3.6 — + 6.4 ×3.8 — 3.8× × + × ÷ + ÷ 3.脱式计算.24 — 24 × ×÷ 12 ÷ ×抱歉 3+6÷3×7-2+5×4-7÷4-6×3-6÷4+5×3=? 巧算:1÷(1+1/2)÷(1+1/3)÷(1+1/4)÷……÷(1+1/20)=1÷(1+1/2)÷(1+1/3)÷(1+1/4)÷……÷(1+1/20)= 27-5÷x=3÷2x+1 6x÷2+(x+4)×4÷2=(6+4)×4÷2解方程,还有(3-10/7﹚÷1/2×2/5这道题怎么做. (3+7)x÷2-7.5=7x÷2解方程 3.2÷0.01= 6.8-10.8= 51×39≈ 1÷ ×3= 8×125%= 7.2+8= 10.8÷1.08×0= (0.25+ )÷10=3/7-3/5+4/7+0.4 (6.9-3.15)÷0.3×0.8 2.5×(1.9+1.9+1.9+1.9) 3、 解方程或解比例(6分)2Ⅹ+2.7=24.7 Ⅹ&sh (1)下列中正确的是( ).(A)6÷(3+2)=6÷3+6÷2=2+3=5(B)(-1)÷(-3)×3分之1=1(C)(-6又4分之3)÷3=-6÷3+(-4分之3)÷3=-4分之9(D)[(-2)-(+2)]÷4=0 5分之1×( )=( )÷4分之7=3分之2+( )=15分之1×( )=( )÷4分之7=3分之2+( )=1在( )里填>或<6分之5÷3( )6分之58÷3分之2( )88分之7÷4分之3( )8分之7 26+9= 57-38= 1500-700= 42×2= 99÷3= 770÷7=660÷3= 960÷3= 180÷9= 65+15= 660÷6= 800×2=50÷5= 3×800= 420÷7= 3×220= 480÷4= 58+33=420-20= 93÷3= 880÷4= 1200-200= 11×7= 80-46=0÷51= 1x2÷1+2x3÷1+3x4÷1+4x5÷1+5x6÷1等于? 2分之3×[1÷(2又10分之1-2.05)+5分之2]=?(6.25+79×6.25)÷0.5=? 简算(1+1÷2+1÷3+1÷4)×(1÷2+1÷3+1÷4+1÷5)-(1+1÷2+1÷3+1÷4+1÷5)×(1÷2+1÷简算(1+1÷2+1÷3+1÷4)×(1÷2+1÷3+1÷4+1÷5)-(1+1÷2+1÷3+1÷4+1÷5)×(1÷2+1÷3+1÷4 ) 3x+(x-1)÷2=3-(2x-1)÷3 (3y-1)÷4=(5y-7)÷6