直接写出得数．= = = == = = =1.5×0.4= 10÷2.5= 2.4×5= 0.78÷1.3=
8151÷39×120+490 410×36﹣7072÷34．
32×800﹣400÷25 先减再乘最后除．
x乘30加上9的和，积是273，求x的值．
864÷[（2193﹣1457）÷23]．
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