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)÷(27×25×24×22),
=(1×2×3…10×11)÷(11×2×6×4×5×5×3×9),
=
,1×2×3…×10×11 11×2×6×4×5×5×3×9
=7×8×2,
=112;