四年级周周练7
用简便方法计算。
98+365+302 176+301 473-73-127
250×23×4 125
99×168+168 72
13×35×2 50
402×25 154
×88 127×125 125×25×2×40 98×99+154 125×23-23×27 ×17×8 ×45 ×125-125×25
382-27-73 17×53-7×53 123-68+77
21+56+79+44 42
158×101-158 9
56×41+56×58+56 42
333×21+999×93 200
-(19+22) 358+99+999+3 129×98+84 450÷4÷25 420+(257-158) ×101-129 ×48+520×45 ÷(4×7)
四年级周周练7答案
用简便方法计算。 98+365+302 =98+302+365 =400+365 =765 176+301 =176+300+1 =476+1 =477
473-73-127 =473-(73+127) =473-200 =273 250×23×4 =250×4×23 =1000×23 =23000 125×88 =125×8×11 =1000×11 =11000
127×23-23×27 =(127-27)×23 =100×23 =2300 99×168+168 =(99+1)×168 =100×168 =16800
72×125 =9×8×125 =9×(8×125) =9×1000 =9000 125×17×8 =125×8×17 =1000×17 =17000 25×32×125 =25×(4×8)×125 =(25×4)×(8×125) =100×1000 =100000 50×25×2×40 =(50×2)×(25×40) =100×1000 =100000 98×45 =(100-2)×45 =100×45-2×45 =4500-90 =4410 402×25 =(400+2)×25 =400×25+2×25 =10000+50 =10050 154×99+154 =(99+1)×154 =100×154
=15400
125×125-125×25 =125×(125-25) =125×100 =12500 382-27-73 =382-(27+73) =382-100 =282
17×53-7×53 =53×(17-7) =53×10 =530 123-68+77 =123+77-68 =200-68 =132
21+56+79+44 =(21+79)+(56+44) =100+100 =200
42-(19+22) =42-22-19 =20-19 =1
358+(257-158) =358-158+257 =200+257 =457
158×101-158 =158×(101-1)
=158×100 =15800 9+99+999+3
=(9+1)+(99+1)+(999+1) =10+100+1000 =1110
129×101-129 =129×(101-1) =129×100 =12900
56×41+56×58+56 =56×(41+58+1) =56×100 =5600 42×98+84 =42×98+42×2 =42×(98+2) =42×100 =4200
450×48+520×45 =45×480+520×45 =45×(480+520) =45×1000 =45000
333×21+999×93 =333×3×7+999×93 =999×(7+93) =999×100 =99900 200÷4÷25 =200÷(4×25)
=200÷100 =2
420÷(4×7) =420÷7÷4 =60÷4 =15
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