1樓:吉田亞理
(1)87.23-11.9-4.1
=87.23-(11.9+4.1)
=87.23-16
=71.23;
(2)13.72+6.84+1.28+9.16=(13.72+1.28)+(6.84+9.16)=15+16
=31;
(3)73.35+28.77-63.35+32.23=(73.35-63.35)+(28.77+32.23)=10+61
=71;
(4)138.69-(57+38.69)
=138.69-38.69-57
=100-57
=43;
(5)74000÷(37×版125)
=74000÷37÷125
=2000÷125
=(2000×8)÷權(125×8)
=16000÷1000
=16;
(6)1.96×77-1.96+1.96×24=1.96×(77-1+24)
=1.96×100
=196.
用遞等式計算,能簡算的要簡算
1 100.18 9.6 18.53,90.58 18.53,109.11 2 0.963 23.89 0.063,0.963 0.063 23.89,0.9 23.89,24.79 3 2.5 0.3 2.5 0.3,2.5 2.5 0.3 0.3,1 0.3 0.3,0.09 4 2.8 10....
遞等式計算(能簡算的要簡算1)9 76 3 2 1 6(2)(8 8)12 5(3)
1 9.76 3.2 1.6,3.05 1.6,4.88 2 8 8 12.5,8 12.5 8 12.5,100 100,200 3 7.5 2.3 2.3 3.5 2.3,2.3 7.5 3.5 1 2.3 10,23 4 10.5 5.3 4.6 8.9,10.5 0.7 8.9,15 8.9...
68x07505用遞等式計算能簡算的要簡算
6.8x0.75 0.5 6.8x0.75x2 6.8x1.4 9.52 6.8x0.75 0.5 遞等式計算 6.8x0.75 0.5 6.8x3 4 1 2 6.8x3 4x2 10.2 1 8x9 7 5 7 8能簡算的要簡算 1 8x9 7 5 7 8可以先將裡面的5 7 8化成5 7 1 ...