7.8÷0.1○7.8 3.5×7.28○7.28 2.7○2.7÷0.8 15×0.6○15×13.6÷1.2○3.6 0.82×0.99○0.82 3.57÷1.05○3.57 5.85÷0.9○5.852.75×1.01○2.75 4.95÷0.9○4.95 1×1.009○1.009 3.6×1.45○3.6.
4.25﹣1.98﹣0.02=4.25﹣(1.98+0.02) .(判断对错)
253﹣80+36与253﹣(80+36)的得数相等. .(判断对错)
51×48=50×48+48 ( )(判断对错)
0.5×(2+200)的简便运算是0.5×2×200. .
653×25×4=653×(25×4),这是应用了 律.