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=