830-250=580, 0.34+0.66=1, 30-19.7=10.3, 6×1 1
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830-250=580, 0.34+0.66=1, 30-19.7=10.3, 6×1 1 6 =7, 0.4×0.6=0.24, 1 1 2 + 1 2 =2, 8.7÷100=0.087, 1÷ 3 5 = 5 3 , 7-3 1 4 =3 3 4 , ( 2 3 - 2 7 )÷21= 8 441 , 4×( 1 8 + 1 4 )=1 1 2 , 1 3 +2× 1 3 - 1 3 = 2 3 .
(1)1.34+4/5+0.66=
1 0.34平方米=( )平方分米
求(1+0.12+0.34)乘(0.12=0.34=0.56)-(1=0.12=0.34=0.56)乘(0.12+0.3
-13×2/3-0.34×2/7=1/3×(-13)-5/7×0.34简便算法
1-0.12+2分之1-0.34+3分之1-0.56+5分之1-0.78=?用简算
^30^x=5,6^(1/1-x)=?
1/6=1/()+1/()
一元一次 x-4/1=3x-3/1.0.6(4-x)-5(0.2x+0.34)+5.3=0.2x-3/2+ x+6/5=
1/2+1/6+1/12+1\20+1/30+1/42+.+1/9900=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56=?
2/1+6/1+12/1+20/1+30/1+42/1+56/1=
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
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