问题 口算题 直接写得数。4.2×0.5=6.7+5.8+3.3=0.16÷0.08=5.1-0.7-2.3=0.29×9+0.28=2.5×0.5=（4.8+2.4）×3.6=0.18÷9=2.52×0.7÷0.07=1.25×0.8×0.5= 答案 2.1；15.8；2；2.1；2.8；1.25；36；0.02；25.2；0.5
