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用简便方法计算.240×35=260×40=308×20=400×90=48×90=160×80=
题目详情
用简便方法计算.
240×35= | 260×40= | 308×20= |
400×90= | 48×90= | 160×80= |
▼优质解答
答案和解析
(1)240×35
=24×10×5×7
=24×5×7×10
=120×7×10
=840×10
=8400;
(2)260×40
=26×4×100
=104×100
=10400;
(3)308×20
=308×2×10
=616×10
=6160;
(4)400×90
=4×9×1000
=36×1000
=36000;
(5)48×90
=48×9×10
=432×10
=4320;
(6)160×80
=16×8×100
=128×100
=12800.
=24×10×5×7
=24×5×7×10
=120×7×10
=840×10
=8400;
(2)260×40
=26×4×100
=104×100
=10400;
(3)308×20
=308×2×10
=616×10
=6160;
(4)400×90
=4×9×1000
=36×1000
=36000;
(5)48×90
=48×9×10
=432×10
=4320;
(6)160×80
=16×8×100
=128×100
=12800.
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