1樓:手機使用者
(1)0.125×
源0.25×8×4,
=(0.125×8)×(0.25×4),
=1×1,
=1;(2)[5-1.7÷(2-1)]×1,=[5-1.7÷1]×1,
=[5-1.7]×1,
=3.3×1,
=3.3;
(3)87×386,
=(86+1)×386,
=86×3
86+1×386,
=3+386,
=3386
;(4)4
9÷(79+4
9)×114,
=49÷119
×114,=4
11×114,
=1;(5)3.9÷1.5-2.3×0.5,=2.6-1.15,
=1.45;
(6)112÷3
4-58×1635,
=2-27,
=157.
脫式計算能簡算的要簡算(1)7分之12-(7分之5+0.5)(2)[1-(0.25+8分之3)]除以4分之1
2樓:學馥刁豐
(1)12/7
-(5/7+0.5)
=(12/7-5/7)-0.5
=1-0.5
=0.5
(2)[1-(0.25+3/8)]÷1/4=[1-(2/8+3/8)]÷1/4
=(1-5/8)÷1/4
=3/8÷1/4
=3/2
(3)(0.875+1/4)(1/8-1/72)=(7/8+2/8)(9/72-1/72)=9/8
×抄8/72
=1/8
(3)(7/5-2/5)÷4/5÷(3/7+3/2×4/9)=1÷4/5÷(3/7+2/3)
=5/4÷(9/21+14/21)
=5/4÷23/21
=105/92=1又
13/92
(你題目有可能打錯了)
解方程(1)
2x+0.4x=7.2
2.4x=7.2
x=7.2÷2.4
x=3(2)
5-2/3x=1/3
2/3x=5-1/3
2/3x=14/3
x=14/3÷2/3
x=7(3)
0.8+1/2x=0.9
1/2x=0.9-0.8
1/2x=0.1
x=0.2
(4)5x-3×7/10=7/5
5x=21/10+14/10
5x=35/10
x=7/10
以後自己做,這麼小不自己算,你長大後會算什麼?
3樓:瑞彭魄卿邃
(1)12/7
-(5/7+0.5)
=(12/7-5/7)-0.5
=1-0.5
=0.5
(2)[1-(0.25+3/8)]÷
zhi1/4
=[1-(2/8+3/8)]÷1/4
=(1-5/8)÷1/4
=3/8÷1/4
=3/2
(3)(0.875+1/4)(1/8-1/72)=(7/8+2/8)(9/72-1/72)=9/8
×8/72
=1/8
(3)(7/5-2/5)÷4/5÷(3/7+3/2×4/9)=1÷4/5÷(3/7+2/3)
=5/4÷(9/21+14/21)
=5/4÷23/21
=105/92=1又
13/92
(你dao
題目有可
版能打錯了)權
解方程(1)
2x+0.4x=7.2
2.4x=7.2
x=7.2÷2.4
x=3(2)
5-2/3x=1/3
2/3x=5-1/3
2/3x=14/3
x=14/3÷2/3
x=7(3)
0.8+1/2x=0.9
1/2x=0.9-0.8
1/2x=0.1
x=0.2
(4)5x-3×7/10=7/5
5x=21/10+14/10
5x=35/10
x=7/10
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