5：6可以写成5÷6，比值是1.2．所以2：3：4=2÷3÷4． ．
直接写出得数． 15×=6= 0.52= 30：= 3.2+0.68= 6×÷6×=
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÷=÷=
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