直接写得数.500÷5=80×50=56+34=2700÷9=2.3+3.4=5.3﹣3.5=8+4.7=12×200=9﹣3.5=15×20=0÷23=2000÷4=
()÷ 20-[(
14.8×6.3-6.3×6.5+8.3×3.7 18.1+(3-0.299÷0.23)×1
5.09-(0.09+1.23) 9.36-(4.36-3.5)
7.5-2.45+7.5+2.45 (-)×21+
2.5×(1.92÷0.3-5.9) 24.5-(7.58+)