简便计算及答案小学四年级
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3.68×4.79＋胡缓6.32×4.79
=(3.68＋6.32)×4.79
=10×4.79
=47.9
26.86×25.66－知做宏16.86×25.66
=(26.86－16.86) ×25.66
=10×25.66
=256.6
5.7×99＋5.7
= 5.7×(99＋1)
=5.7×100
=570
34×9.9
=34×(10－0.1)
=34×10－34×0.1
=340－搭册3.4
=336.6
57×101
=57×(100＋1)
=57×100＋57×1
=5757
7.8×1.1
=7.8×(1＋0.1)
=7.8×1＋7.8×0.1
=7.8＋0.78
=8.58
=(3.68＋6.32)×4.79
=10×4.79
=47.9
26.86×25.66－知做宏16.86×25.66
=(26.86－16.86) ×25.66
=10×25.66
=256.6
5.7×99＋5.7
= 5.7×(99＋1)
=5.7×100
=570
34×9.9
=34×(10－0.1)
=34×10－34×0.1
=340－搭册3.4
=336.6
57×101
=57×(100＋1)
=57×100＋57×1
=5757
7.8×1.1
=7.8×(1＋0.1)
=7.8×1＋7.8×0.1
=7.8＋0.78
=8.58
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