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计算下面各题,注意使用简便方法 (3/4%2/3)÷1/5 (3...

(1) 7 3 × 5 7 ÷ 1 3 ,= 7 3 × 5 7 ×3,=5;(2)420×( 3 7 + 5 6 ),=420× 3 7 +420× 5 6 ,=180+350,=530;(3) 4 25 ×99+ 4 25 ,= 4 25 ×(99+1),= 4 25 ×100,=16;(4) 5 9 ×7+ 5 9 ×11,= 5 9 ×(7+11),= 5 9 ×18,=10.

1/2减(3/4减3/8) =1/2-(3/4-3/8) =1/2- 3/8 =1/8

(1)4.82-5.2÷0.8×0.6,=4.82-6.5×0.6,=4.82-3.9,=0.92;(2)[ 1 2 -( 3 4 - 3 5 )]÷ 7 10 ,=[ 1 2 - 3 20 ]÷ 7 10 ,= 7 20 ÷ 7 10 ,= 1 2 ;(3) 7 9 × 5 11 + 2 9 × 5 11 ,=( 7 9 + 2 9 )× 5 11 ,=1× 5 11 ,= 5 11 ;(4)12....

(1)2.3+3.91÷(22-19.7)=2.3+3.91÷2.3=2.3+1.7=4(2)21.6÷[64.8-(48.6-2.7×2)]=21.6÷[64.8-(48.6-5.4)]=21.6÷[64.8-43.2]=21.6÷21.6=1(3)0.25×0.03×4 =(0.25×4)×0.03=1×0.03=0.030.13×3.89+0.13×5.11 =0.13×(3.89+5.11)=0.13×9=1....

题目没有错吧

(1)10.15-10.75×0.4-5.7,=10.15-4.3-5.7,=10.15-(4.3+5.7),=10.15-10,=0.15;(2)5.8×(3.87-0.13)+4.2×3.74,=5.8×3.74+4.2×3.74,=(5.8+4.2)×3.74,=10×3.74,=37.4;(3)32.52-(6+9.728)÷3.2×2.5,=32.52-15.728÷3.2×2.5,=3...

1/3-(4/5-2/3)÷3/5 =1/3-(4/5-2/3)*5/3 =1/3-4/5*5/3+2/3*5/3 =1/3-4/3+10/9 =-1+1+1/9 =1/9

(1)9.6-11÷7+17×4=9.6-117+47=9.6-(117-47)=9.6-1=8.6;(2)318×7.4-318+3.6×3.125=3.125×7.4-3.125+3.6×3.125=3.125×(7.4-1+3.6)=3.125×10=31.25.

应是分子与分母反了

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