一、口算。
$1.5÷0.25=$
$9.6 - 0.16=$
$7×33=$
$0.8 - 0.02=$
$6÷1.5=$
$5.05 + 5.7=$
$7.2÷0.6=$
$130×0.9=$
$13.5÷0.45=$
$100 - 35.22=$
$5.1÷0.17=$
$1.6 + 4.04=$
$3.2×0.8=$
$2.59 + 3.62=$
$0.36 - 0.17=$
$0.32 + 1.8=$
$400 - 21=$
$0.81÷0.009=$
$12.4 - 3.8=$
$749÷7=$
$0.48×0.6=$
$800×1.25=$
$7.46 + 3.3=$
$5.6 - 4.14=$
$1.5÷0.25=$
6
$9.6 - 0.16=$
9.44
$7×33=$
231
$0.8 - 0.02=$
0.78
$6÷1.5=$
4
$5.05 + 5.7=$
10.75
$7.2÷0.6=$
12
$130×0.9=$
117
$13.5÷0.45=$
30
$100 - 35.22=$
64.78
$5.1÷0.17=$
30
$1.6 + 4.04=$
5.64
$3.2×0.8=$
2.56
$2.59 + 3.62=$
6.21
$0.36 - 0.17=$
0.19
$0.32 + 1.8=$
2.12
$400 - 21=$
379
$0.81÷0.009=$
90
$12.4 - 3.8=$
8.6
$749÷7=$
107
$0.48×0.6=$
0.288
$800×1.25=$
1000
$7.46 + 3.3=$
10.76
$5.6 - 4.14=$
1.46
答案
一、6 9.44 231
0.78 4 10.75
12 117 30
64.78 30 5.64
2.56 6.21 0.19
2.12 379 90
8.6 107 0.288
1000 10.76 1.46
0.78 4 10.75
12 117 30
64.78 30 5.64
2.56 6.21 0.19
2.12 379 90
8.6 107 0.288
1000 10.76 1.46
二、解方程。
$0.5x + 1.62 = 2.47$
$12x - 9x = 8.7$
$4x - 1.3×6 = 2.6$
$17(x + 3) = 289$
$32x÷11 = 16$
$(93 - x)÷1.5 = 48$
$0.5x + 1.62 = 2.47$
$12x - 9x = 8.7$
$4x - 1.3×6 = 2.6$
$17(x + 3) = 289$
$32x÷11 = 16$
$(93 - x)÷1.5 = 48$
答案
方程$0.5x + 1.62 = 2.47$
解:
$0.5x+1.62 = 2.47$
$0.5x=2.47 - 1.62$
$0.5x = 0.85$
$x = 0.85÷0.5$
$x = 1.7$
方程$12x - 9x = 8.7$
解:
$12x-9x = 8.7$
$3x = 8.7$
$x = 8.7÷3$
$x = 2.9$
方程$4x - 1.3×6 = 2.6$
解:
$4x-1.3×6 = 2.6$
$4x - 7.8 = 2.6$
$4x=2.6 + 7.8$
$4x = 10.4$
$x = 10.4÷4$
$x = 2.6$
方程$17(x + 3) = 289$
解:
$17(x + 3)=289$
$x + 3 = 289÷17$
$x + 3 = 17$
$x = 17 - 3$
$x = 14$
方程$32x÷11 = 16$
解:
$32x÷11 = 16$
$32x = 16×11$
$32x = 176$
$x = 176÷32$
$x = 5.5$
方程$(93 - x)÷1.5 = 48$
解:
$(93 - x)÷1.5 = 48$
$93 - x = 48×1.5$
$93 - x = 72$
$x = 93 - 72$
$x = 21$
综上,方程的解分别为$x = 1.7$;$x = 2.9$;$x = 2.6$;$x = 14$;$x = 5.5$;$x = 21$。
解:
$0.5x+1.62 = 2.47$
$0.5x=2.47 - 1.62$
$0.5x = 0.85$
$x = 0.85÷0.5$
$x = 1.7$
方程$12x - 9x = 8.7$
解:
$12x-9x = 8.7$
$3x = 8.7$
$x = 8.7÷3$
$x = 2.9$
方程$4x - 1.3×6 = 2.6$
解:
$4x-1.3×6 = 2.6$
$4x - 7.8 = 2.6$
$4x=2.6 + 7.8$
$4x = 10.4$
$x = 10.4÷4$
$x = 2.6$
方程$17(x + 3) = 289$
解:
$17(x + 3)=289$
$x + 3 = 289÷17$
$x + 3 = 17$
$x = 17 - 3$
$x = 14$
方程$32x÷11 = 16$
解:
$32x÷11 = 16$
$32x = 16×11$
$32x = 176$
$x = 176÷32$
$x = 5.5$
方程$(93 - x)÷1.5 = 48$
解:
$(93 - x)÷1.5 = 48$
$93 - x = 48×1.5$
$93 - x = 72$
$x = 93 - 72$
$x = 21$
综上,方程的解分别为$x = 1.7$;$x = 2.9$;$x = 2.6$;$x = 14$;$x = 5.5$;$x = 21$。
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