1.02×5.5和18.8×101-18.8、2.5×4.4用简便运算计算
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1.02×5.5和18.8×101-18.8、2.5×4.4用简便运算计算
1.02×5.5和18.8×101-18.8、2.5×4.4用简便运算计算
1.02×5.5和18.8×101-18.8、2.5×4.4用简便运算计算
1.02×5.5
=(1+0.02)×5.5
=1×5.5+0.02×5.5
=5.5+0.11
=5.61
18.8×101-18.8
=18.8×101-18.8×1
=18.8×(101-1)
=18.8×100
=1880
2.5×4.4
=2.5×(4+0.4)
=2.5×4+2.5×0.4
=10+1
=11
1.02×5.5
=(1+0.02)×5.5
=1×5.5+0.02×5.5
=5.5+0.11
=5.65
18.8×101-18.8、
=18.8×(101-1)
=18.8×100
=1880
2.5×4.4
=2.5×(4+0.4)
=2.5×4+2.5×0.4
=10+1
=11
1.02×5.5
= 1×5.5+0.02×5.5
= 5.5+0.11
= 5.61
18.8×101-18.8
= 18.8×(101 - 1)
= 18.8×100
=1880
2.5×4.4
=2.5×4×1.1
=10×1.1
=11
你这道题可以用“拆分法”和“乘法分配律”来做
1、 1.02×5.5……
=(1+0,02)×5,5
=1×5.5+0.02×5.5
=5,5+0.11
=5.61
2、18.8×101-18.8
=18.8×(101-1)
=1880
3、 2.5×4.4 ……这样想:把4.4分成(...
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你这道题可以用“拆分法”和“乘法分配律”来做
1、 1.02×5.5……
=(1+0,02)×5,5
=1×5.5+0.02×5.5
=5,5+0.11
=5.61
2、18.8×101-18.8
=18.8×(101-1)
=1880
3、 2.5×4.4 ……这样想:把4.4分成(4×1.1)
=2.5×4×1.1
=10×1.1
=11
另2.5×4.4
=2.5×(4+0.4)
=2.5×4+2.5×0.4
=10+1
=11
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