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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...

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 ...

(1)7.65-0.65×6,=7.65-3.9,=3.75;(2)9.43-1.68-4.32,=9.43-(1.68+4.32),=9.43-6,=3.43;(3)1.25×0.76×0.8,=(1.25×0.8)×0.76,=1×0.76,=0.76;(4)0.32×7.5-0.32×4.5,=0.32×(7.5-4.5),=0.32×3,=0.96;(5)3.8×10.1,=3....

(1)1.29+3.7+2.71+6.3,=(1.29+2.71)+(3.7+6.3),=4+10,=14;(2)3.75÷[0.3×(1.34-0.84)],=3.75÷[0.3×0.5],=3.75÷0.15,=25;(3)7.2×7.2+7.2×2.8,=7.2×(7.2+2.8),=7.2×10,=72;(4)0.25×0.8×0.125×4,=(0.25×4)×(0.125×0...

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)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,=...

(1)178÷12.5÷0.8=178÷(12.5×0.8)=178÷10=17.8(2)1.7×6.3+1.7×3.7=(6.3+3.7)×1.7=17(3)36-36÷1.2=36-30=6(4)12.5÷2.5+7.5=5+7.5=12.5

(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....

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