口算．
800﹣250= 30×40= 8100÷900= 10﹣0.98= 105÷7= 560+770=
0.25×0.4= 6.3÷0.07= 0.64÷8= 8.85×10= 4.73+0.7= 
=
= 
= 
= 3.6×
= 8×1.36×1.25= 7.2×2.8+2.8×0.8=
口算．
800﹣250= 30×40= 8100÷900= 10﹣0.98= 105÷7= 560+770=
0.25×0.4= 6.3÷0.07= 0.64÷8= 8.85×10= 4.73+0.7= == = = 3.6×= 8×1.36×1.25= 7.2×2.8+2.8×0.8=
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