用简便方法计算 125×8.8 1.3+4.25+3.7+3.75 4.8×1.01 17.16-(3.5-2.85) 3.4×99+3.4
用简便方法计算125×8.81.3+4.25+3.7+3.754.8×1.0117.16-(3.5-2.85)3.4×99+3.41321×17+1721×8725×10...
用简便方法计算 125×8.8 1.3+4.25+3.7+3.75 4.8×1.01 17.16-(3.5-2.85) 3.4×99+3.4 13 21 ×17+ 17 21 ×8 7 25 ×100 1 7 7 9 ÷ 11 5 + 5 11 × 2 9 64.2×87+64.2×13.
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(1)125×8.8, =125×8×1.1, =1000×1.1, =1100; (2)1.3+4.25+3.7+3.75, =(1.3+3.7)+(4.25+3.75), =5+8, =13; (3)4.8×1.01, =4.8×1+4.8×0.01, =4.8+0.048, =4.848; (4)17.16-(3.5-2.85), =17.16+2.85-3.5, =20.01-3.5, =16.51; (5)3.4×99+3.4, =3.4×(99+1), =3.4×100, =340; (6)
=(
=1×17, =17; (7)
=
=28 +
=28
(8)
=(
=1×
=
(9)64.2×87+64.2×13. =64.2×(87+13), =64.2×100, =6420. |
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