脱式计算，能简算的要简算①2.9×1.4+2×1.6 ②（2.44﹣1.8）÷0.4×20 ③4.6×9+4.6．
直接写出得数．========
直接写出得数．============
计算．﹣++（+） 7﹣（﹣）．
直接写得数：+=﹣=﹣=﹣=+=﹣= 1﹣=+=﹣=+=+5= 5﹣=
直接写得数．+=+=﹣= 0.25×8= 0.9×0.2=﹣=+= 10﹣= 1.25×（0.8+0.08）= 0.25×3.2=
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= 0.25×8= 0.9×0.2=
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= 1.25×（0.8+0.08）= 0.25×3.2=
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