0.25×(4.8+1)用简便方法
能用简便方法计算的用简便方法计算.78-1.46+1.54;18.5-3.21-4.79;3.72×9.9;4.5×0.7+5.5×0.7;0.4×(2.5+0.25);...
能用简便方法计算的用简便方法计算. 78-1.46+1.54; 18.5-3.21-4.79; 3.72×9.9; 4.5×0.7+5.5×0.7; 0.4×( 2.5+0.25 ); 82.4-12.4×5; 14.2×9.9+1.42; 4.8+3.72+4.2+16.28.
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①78-1.46+1.54
=76.54+1.54
=78.08
②18.5-3.21-4.79
=18.5-(3.21+4.79)
=18.5-7
=11.5
③3.72×9
=3.72×(10-1)
=37.2-3.72
=33.48
④4.5×0.7+5.5×0.7
=(4.5+5.5)×0.7
=10×0.7
=7
⑤0.4×( 2.5+0.25 )
=0.4×2.5+0.25×0.4
=1+0.1
=1.1
⑥82.4-12.4×5
=82.4-62
=20.4
⑦14.2×9.9+1.42
=1.42×99+1.42
=1.42×100
=142
⑧4.8+3.72+4.2+16.28
=(4.8+4.2)+(16.28+3.72)
=9+20
=29
=76.54+1.54
=78.08
②18.5-3.21-4.79
=18.5-(3.21+4.79)
=18.5-7
=11.5
③3.72×9
=3.72×(10-1)
=37.2-3.72
=33.48
④4.5×0.7+5.5×0.7
=(4.5+5.5)×0.7
=10×0.7
=7
⑤0.4×( 2.5+0.25 )
=0.4×2.5+0.25×0.4
=1+0.1
=1.1
⑥82.4-12.4×5
=82.4-62
=20.4
⑦14.2×9.9+1.42
=1.42×99+1.42
=1.42×100
=142
⑧4.8+3.72+4.2+16.28
=(4.8+4.2)+(16.28+3.72)
=9+20
=29
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