56.74-12.62-24.38+3.26简便运算
你能想出简便方法来计算下面各题吗?26×5+74×5+56.74+12.62+24.38+3.260.89×4.8+5.2×0.890.4×99+0.434.5-(17....
你能想出简便方法来计算下面各题吗? 26×5+74×5+5 6.74+12.62+24.38+3.26 0.89×4.8+5.2×0.89 0.4×99+0.4 34.5-(17.2+4.5) 87-2.123-0.877 (40+8)×125 32×3.8+32×6.2
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①26×5+74×5+5
=(26+74)×5+5
=500+5
=505
②6.74+12.62+24.38+3.26
=(6.74+3.26)+(12.62+24.38)
=10+37
=47
③0.89×4.8+5.2×0.89
=0.89×(4.8+5.2)
=0.89×10
=8.9
④0.4×99+0.4
=0.4×(99+1)
=0.4×100
=40
⑤34.5-(17.2+4.5)
=34.5-4.5-17.2
=30-17.2
=12.8
⑥87-2.123-0.877
=87-(2.123-0.877)
=87-3
=84
⑦(40+8)×125
=40×125+8×125
=5000+1000
=6000
⑧32×3.8+32×6.2
=32×(3.8+6.2)
=32×10
=320
=(26+74)×5+5
=500+5
=505
②6.74+12.62+24.38+3.26
=(6.74+3.26)+(12.62+24.38)
=10+37
=47
③0.89×4.8+5.2×0.89
=0.89×(4.8+5.2)
=0.89×10
=8.9
④0.4×99+0.4
=0.4×(99+1)
=0.4×100
=40
⑤34.5-(17.2+4.5)
=34.5-4.5-17.2
=30-17.2
=12.8
⑥87-2.123-0.877
=87-(2.123-0.877)
=87-3
=84
⑦(40+8)×125
=40×125+8×125
=5000+1000
=6000
⑧32×3.8+32×6.2
=32×(3.8+6.2)
=32×10
=320
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