简便计算18.4×2.5×4 11.98×99+11.98 1.25×32×0.2589.7﹣7.83﹣2.17 50.2÷25÷0.4 0.8×（12.5+25）
直接写得数×15=×2=×=×=×= 1×=×=×34=×=×=×=×=÷10=÷= 0÷=÷4= 1÷= 22÷=÷=÷0.4=
直接写出得数．×25=÷6= 0.54+O.46= 9﹣= （）×30== 177+99= 3÷7== 0.9×99+0.9=
×16=×=﹣=×= 6÷=÷=÷4=÷=+=﹣= 100×= 8×= 1÷=﹣= 12÷= 0×=
直接写得数．×0=×=×12=×= 45×=÷=×=÷= 18×=×= 1÷=÷=
直接写出得数．×12=÷=（ ）2= 4﹣4×= 1×= 43÷=÷=×8+×8= 0.9×= 12×﹣=×7÷×7==
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