脱式计算(能用简便方法的用简便方法计算)[( 7 16 - 1 4 )+ 15 16
脱式计算(能用简便方法的用简便方法计算)[(716-14)+1516]÷126134-15.37+3814-34.6323-89×38÷1275.8×99-4.210.6...
脱式计算(能用简便方法的用简便方法计算)[( 7 16 - 1 4 )+ 15 16 ]÷ 1 2 61 3 4 -15.37+ 38 1 4 -34.6323- 8 9 × 3 8 ÷ 1 27 5.8×99-4.210.6-(6.3+0.125÷12.5%)
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(1)[(
=[
=
=2.25; (2) 61
=( 61
=100-50, =50; (3)23-
=23-
=23-9, =14; (4)5.8×99-4.2, =5.8×(100-1)-4.2, =580-5.8-4.2, =580-(5.8+4.2), =580-10, =570; (5)10.6-(6.3+0.125÷12.5%), =10.6-(6.3+1), =10.6-7.3, =3.3. |
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