48.6乘1.4-0.14乘18.8 =48.6 x1.4 -0.14 x18.8 =48.6x1.4-1.4 x1.88 =1.4x(48.6+1.88) =1.4x50.48 =1.4 x(50+0.5-0.02) =70 + 0.7 -0.028 =70.672
48.6乘1.4-0.14乘18.8简便运算怎么做
48.6乘1.4-0.14乘18.8 =48.6 x1.4 -0.14 x18.8 =48.6x1.4-1.4 x1.88 =1.4x(48.6+1.88) =1.4x50.48 =1.4 x(50+0.5-0.02) =70 + 0.7 -0.028 =70.672