问题 解答题
口算
13×40=560÷40=3÷100=0.28×100÷10=
3-1.4=3.7+1.13=120×6=125×7×8=
45×20=2.5+0.9=0÷78=10-2.3-2.7=
84÷4=101×28=1000×0.013=25×12+25×28=
答案

13×40=520,560÷40=14,3÷100=0.03,0.28×100÷10=2.8,
3-1.4=1.6,3.7+1.13=4.83,120×6=720,125×7×8=7000,
45×20=900,2.5+0.9=3.4,0÷78=0,10-2.3-2.7=5,
84÷4=21,101×28=2828,1000×0.013=13,25×12+25×28=1000,

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