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计算下面各题,能简算的要简算.(1)9.86%3.4÷1.7...

(1)9.86-3.4÷1.7×1.3,=9.86-2×1.3,=9.86-2.6,=7.26;(2)0.36×3.9+3.9×1.64,=3.9×(0.36+1.64),=3.9×2,=7.8;(3)7.23-(2.8+1.23),=7.23-1.23-2.8,=6-2.8,=3.2;(4)1.64×2.5+2.1÷0.6,=4.1+3.5,=7.6;(5)2.4×(0.85÷1.7)-...

3/1+7/2—4/1 1/3-1/4+2/7 =28/84-21/84+12/84 =19/84 答

(1)2 3 4 -1.375+7.25-6 5 8 ,=2.75+7.25-(1.375+6.625),=10-8,=2;(2)888 8 9 ×1.125.=888×1.125+ 8 9 × 9 8 ,=999+1,=1000;(3)2000-1999×0.83-199.9×1.7.=2000-(1999×0.83+1999×0.17),=2000-1999×(0.83+0.17),=2000-19...

①48-2.3×12,=48-27.6,=20.4;②50×(0.8+0.4),=50×0.8+50×0.4,=40+20,=60;③7.34×2.1+7.34×7.8+7.34×1.1,=7.34×(2.1+7.8+1.1),=7.34×10,=73.4;④20.5÷1.25÷0.8,=20.5÷(1.25×0.8),=20.5÷1,=20.5;⑤(8.1-5.4)÷3.6+85.7,=2.7÷3.6...

(1)4.32÷2.4×1.7,=1.8×1.7,=3.06;(2)16.2×4.5+3.8×4.5,=(16.2+3.8)×4.5,=20×4.5,=90;(3)9.05-3.86-3.14,=9.05-(3.86+3.14),=9.05-7,=2.05;(4)7.28+0.72÷0.9,=7.28+0.8,=8.08.

①7.8-8.75+2.2-1.25,=(7.8+2.2)-(8.75+1.25),=10-10,=0;②13.2÷(9.4-5)+5.32,=13.2÷4.4+5.32,=3+5.32,=8.32;③1- 3 7 - 4 7 ,=1-( 3 7 + 4 7 ),=1-1,=0;④ 13 17 -( 5 17 + 1 10 ),= 13 17 - 5 17 - 1 10 ,= 8 17 - 1 10 ...

5分之7/9-5分之2*9分之1 =7/5*1/9-2/5*1/9 =(7/5-2/5)*1/9 =1*1/9 =1/9 3分之1/【4*(6分之5-4分之3)】 =1/3÷【4*1/12】 =1/3÷1/3 =1 (2-2分之1/4分之3)/9分之2 =(2-2/3)×9/2 =2×9/2-2/3×9/2 =9-3 =6 18*(3分之2+2分之3-9分之5) =18*2/3+18*3/2...

计算下面各题,能简算的要简算 1/2+4/7+3/7 =1/2+(4/7+3/7) =1/2+1 =1又1/2 1/10+3/8-2/5 =19/40-2/5 =3/40 1-(2/3+1/8) =1-2/3-1/8 =1/3-1/8 =5/24 7/8-(2/3-1/4) =7/8+1/4-2/3 =9/8-2/3 =11/24 1/9+(1/6+2/9)+5/6 =(1/9+2/9)+(1/6+5/6) ...

(1)7.05×23.7+7.05×76.3=(23.7+76.3)×7.05,=100×7.05,=705;(2)0.125×3.2×2.5 =(0.125×8)×(0.4×2.5),=1×1,=1;(3)7.8-1.9+8.2-8.1=(7.8+8.2)-(1.9+8.1),=16-10,=6;(4)44.28÷0.9÷4.1=49.2÷4.1,=12;(5)9.07-22.78÷3....

(1)1.72+6.03+8.97+2.28,=(1.72+2.28)+(6.03+8.97),=4+15,=19;(2)25×48×125,=(25×6)×(8×125),=150×1000,=150000;(3)72.27-7.44-2.56,=72.27-(7.44+2.56),=72.27-10,=62.27;(4)(64-224÷14)×12,=(64-16)×12,=...

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