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脱式计算:(1)8/9×[7/8%(7/16%1/8)](2)10×3...

(1)8/9×[7/8-(7/16-1/8)](2)10×3/4+17×75%-7×0. =8/9×[7/8-7/16+1/8] =8/9×[7/8+1/8-7/16] =8/9×[1-7/16] =8/9×9/16 =1/2 (2)10×3/4+17×75%-7×0.75 [3/4=75%=0.75] =0.75×(10+17-7) =0.75×20 =15

(1)9.8×75+75×0.2,=(9.8+0.2)×75,=10×75,=750;(2)0.78÷0.25÷40,=0.78÷(0.25×40),=0.78÷10,=7.8;(3)7.2+2.8×5.06,=7.2+14.86,=21.368;(4)56×10.1,=56×(10+0.1),=56×10+5.6×0.1,=560+0.56,=560.56.

=4.71×(3.2+7.8-1) =4.71×10 =47.1

(1) 8 9 ×[ 3 4 -( 7 16 - 1 4 )],= 8 9 ×( 3 4 - 3 16 ),= 8 9 × 3 4 - 8 9 × 3 16 ,= 2 3 - 1 6 ,= 1 2 ;(2)[ 1 2 -( 3 4 - 3 5 )]÷ 7 10 ,=( 1 2 - 3 20 )÷ 7 10 ,= 7 20 ÷ 7 10 ,= 1 2 ;(3) 7 9 ÷ 11 5 + 2 9 × 5 1...

7/8+2/3×1/10+1/8 =7/8+1/8+1/15 =1+1/15 =1又1/15

red

(1/8-3/14+1/7)*12 =【1/8-(3/14-1/7)】*12 =【1/8-1/14】*12 =1/8*12-1/14*12 =3/2-6/7 =9/14

8/13*1/7+1/7*6/13=1/7(8/13+6/13)=2/13

好的

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