直接写得数．
0.3×1.5= 1.2×0.7= 0.43×2=
0.09×0.5= 1.6×0.25= 8.04×50=
0.7×0.9×10= 8×0.9+8×2.1=
0.75×0.66=
11.05×0.04=
0.43×2.25=
4.82×11.23=
竖式计算.
0.86×7= 19.5×1.8= 3.25×50=
2.8×0.94= 0.375×1.4= 0.67×8.6=
口算．
2.5×0.6×0.4= 1.25×0.7×0.8=
0.1×0.2×0.3= 5.4﹣0.4×5=
0.26×0.2×50= 0.5×0.75×4=
12.5×0.1×0.8= 0.4×0.1×0.25=
一只草原牛的身高是蒙古牛的l.2倍，体重是蒙古牛的1.4倍．
（1）草原牛的身高是多少？（2）一只草原牛与一只蒙古牛共有多重？
