简算 2.5×8×0.4×0.125 0.65×201 6.81+6.81×99 (1×2×3…10×11)÷(27×25×24×22)
问题描述:
简算 2.5×8×0.4×0.125 |
0.65×201 |
6.81+6.81×99 | (1×2×3…10×11)÷(27×25×24×22) |
答
(1)2.5×8×0.4×0.125,=(2.5×0.4)×(8×0.125),=1×1,=1;(2)0.65×201,=0.65×200+0.65×1,=130+0.65,=130.65;(3)6.81+6.81×99,=6.81×(1+99),=6.81×100,=681;(4)(1×2×3…10×11)...