Question

【題目】計算下面各題，能簡算的要簡算。
9.8×4.3= 1.25×0.32×0.25=
3.4÷12.5÷0.8= 28.4×99＋28.4=

Answer 1

【答案】42.14；0.1；0.34；2840
【解析】9.8×4.3
=(10-0.2)×4.3
=10×4.3-0.2×4.3
=43-0.86
=42.14
1.25×0.32×0.25
=(1.25×0.8)×(0.4×0.25)
=1×0.1
=0.1
3.4÷12.5÷0.8
=3.4÷(12.5×0.8)
=3.4÷10
=0.34
28.4×99+28.4
=28.4×99+28.4×1
=28.4×(99+1)
=28.4×100
=2840
所以答案是：42.14；0.1；0.34；2840