直接写得数．
3.86+2.4=         7.6﹣0.56=          4.5×102=          3.25+2.3+1.75=
361+199=          7÷0.4=             4=          =
2.5×32=          =               0.1÷0.01=          3.47﹣（2.5+0.47）=
4768÷791≈       12÷=             1÷==     5.58÷0.78≈
4.98×7.11≈       =            =