直接写出得数。4500÷500= 840÷40= 93×200= 1400÷20= 180÷20= 350÷70=85÷17= 950÷19=144÷12= 63÷21= 780÷13= 630÷21=
19175÷59+678 36.5×1.4-8.51
()÷20-[(
14.8×6.3-6.3×6.5+8.3×3.718.1+(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+