看图计算。
口算 55+37= 80﹣26= 1400﹣800= 2+210= 9+300= 82+0= 1﹣= += ﹣= ．
口算我最棒.+= += ﹣= ﹣=+= 1+= ﹣0.2= +0.3=+= 1﹣+= ﹣﹣= ++=
= = = =0.32= = = == 2x+x=
240﹣40÷4= 125×（8+8）= ÷12=6 2000×3+60=320×11÷32= 1﹣= 24×5﹣25×4= 8×13×25=4005÷19≈
口算．300×7= 40+300= 58÷7= 40×8=720﹣90= 3200﹣3000= 0×800= 45÷9=5×60= 4+6×4= 604×3≈ 695×9≈705+196≈ 397×4≈ 78×5≈ +=1﹣= ﹣ += 80﹣20×0=
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﹣
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﹣
﹣
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= 1+
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﹣0.2= 
+0.3=
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= 1﹣
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﹣
﹣
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+
+
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= 2x+x=
= 24×5﹣25×4= 8×13×25== 24×5﹣25×4= 8×13×25=
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=
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﹣
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= 80﹣20×0=
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