脱式计算(能简算的要简算)

7.8÷【32X(1-5/8)+3.6】 (0.98X99+0.98)÷49

4/11-6/13+7/9X(9/11-9/13) 9/13÷8+1/8X7/13

7.8÷【32X(1-5/8)+3.6】 (0.98X99+0.98)÷49
=7.8÷[32X3/8+3.6] =0.98X(99+1)÷49
=7.8÷[12+3.6] =98÷49
=7.8÷15.6 =2
=0.5
4/11-6/13+7/9X(9/11-9/13) 9/13÷8+1/8X7/13
=4/11-6/13+7/11-7/13 =9/13X1/8+1/8X7/13
=(4/11+7/11)-(6/13+7/13) =1/8X(9/13+7/13)
=1-1 =1/8X16/13
=0 =2/13
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第1个回答  2013-05-12
(1)7.8÷【32X(1-5/8)+3.6】
=7.8÷[32×3/8+3.6]
=7.8÷15.6
=1/2

(2)(0.98X99+0.98)÷49
=0.98(99+1)÷49
=(0.98×100)÷49
=1/49

(3)4/11-6/13+7/9X(9/11-9/13)
=4/11-6/13+7/9*9/11-7/9*9/13
=4/11-6/13+7/11-7/13
=11/11-13/13
=1-1
=0

(4) 9/13÷8+1/8X7/13
=9/13×1/8+1/8×7/13
=1/8(9/13+7/13)
=1/8×16/13
=2/13
第2个回答  2013-05-12
1,=7.8/(32-32*5+3.6)=7.8/(32-20+3.6)=7.8/(12+3.6)=7.8/(12+3.6)=7.8/(7.8*2)=0.5
2,=(0.98*100)/49=98/49=2
3,=(4*13-6*11)/(11*13)+7/9[(9*13-9*11)/(11*13)]=-13/143+14/143=1/143
4,=9/13*1/8+1/8*7/13=16/(13*18)=2/13
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