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3.88×4.2×5.8÷(1.9×1.4×2.9)简便运算

①625×80-2520÷24,=50000-105,=49895;②(6+10.88÷3.2)×1.5,=(6+3.4)×1.5,=9.4×1.5,=14.1;③ 1 9 × 10 13 + 8 13 ÷ 9,= 1 9 × 10 13 + 8 13 × 1 9 ,=( 10 13 + 8 13 )× 1 9 ,= 18 13 × 1 9 ,= 2 13 ;④[( 6 5 - 1 2 )÷14]× 4 3 ...

(1/3+1/5)×15 =1/3×15+1/5×15 =5+3 =8 (1/9+1/3)×27 =1/9×27+1/3×27 =3+9 =12 (1/6+1/4)×36 =1/6×36+1/4×36 =6+9 =15 89×7/88 =(88+1)×7/88 =7+7/88 =7又7/88

1.2÷0.02=600.6+1.3=1.93.08×0.45=1.3869.88÷1.9=5.2验算:3.92÷3.7≈1.06

0.5+1.6=2.1 7.2-4=3.2 1+0.38=1.38 40×9=360 88+57=145 54÷3=18 2.9-0.7=2.2 392-83=309 25×6=150 6.5-3.5=3 16×5=80 3.4+2.7=6.1 0×340÷17=0 25×4+30=130 125×8×3=3000 1.2+1.8+0=3

69.8-(4.7+19.8)=(69.8-19.8)-4.7=50-4.7=45.3 4.74-8.98+15.98=4.74+(15.98-8.98)=4.74+7=11.74 2.5-1.98=2.5-(2-0.02)=2.5-2+0.02=0.52 7.2*9.9=7.2*(10-0.1)=72-0.72=71.28 7.2*10.1=7.2(10.0.1)=72+0.72=72.72 88.8*1.25=(80+8+0.8)*1.25=80...

①12.5×8.88=12.5×(1.11×8)=(12.5×8)×1.11=100×1.11=111②1.9+19.9+199.9+0.3=1.9+19.9+199.9+0.1+0.1+0.1=(1.9+0.1)+(19.9+0.1)+(199.9+0.1)=2+20+200=222③10.01×101-10.01=10.01×(101-1)=10.01×100=1001

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