先估一估积是几位数，再连一连．
计算下面各题，能简算的要简算． 1.25×2.5×0.832.64÷2.04×0.3 1.5×101﹣1.510.1×7.8 13÷0.4÷2.52.8×7.3+0.27×28．
用递等式计算． 600﹣（4.06+6.4）×0.5 3.69×7.5+36.9×0.25．
用递等式计算，能简便的要简便计算 8.3﹣2.4×1.523.4÷7.8+2.1 2.5×6.3+2.5×3.71.25×2.3×0.8．
直接写出得数． 0.5×0.8=0.03+1.7=0.63÷0.07=2.5×3.1×0.4= 4÷0.01=1﹣0.66=7.2×0.6=0.2×0.2÷0.2×0.2=
脱式计算，能简算要简算． 72.8÷2.5÷40.83×7.2+0.83×2.818.305÷0.14﹣58.67 7.8×9.9．
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