脱式计算(能简算的用简算).4.2×7.8+2.2×4.2 9.5×101 3.65×88+3.65×11+3.65 49.5×0.2-2.07÷23(1-0.2)÷(1-0.84)6.4÷0.8-1.5×4 2.6×1.9÷2.6×1.9 16.75-(9.1-1.92)+1.62
(1)4.2×7.8+2.2×4.2
=4.2×(7.8+2.2)
=4.2×10
=42;
(2)9.5×101
=9.5×(100+1)
=9.5×100+9.5×1
=950+9.5
=959.5;
(3)3.65×88+3.65×11+3.65
=3.65×(88+11+1)
=3.65×100
=365;
(4)49.5×0.2-2.07÷23
=9.9-0.09
=9.81;
(5)(1-0.2)÷(1-0.84)
=0.8÷0.16
=5;
(6)6.4÷0.8-1.5×4
=8-6
=2;
(7)2.6×1.9÷2.6×1.9
=(2.6÷2.6)×(1.9×1.9)
=1×3.61
=3.61;
(8)16.75-(9.1-1.92)+1.62
=16.75-7.18+1.62
=9.57+1.62
=11.19.
=4.2×(7.8+2.2)
=4.2×10
=42;
(2)9.5×101
=9.5×(100+1)
=9.5×100+9.5×1
=950+9.5
=959.5;
(3)3.65×88+3.65×11+3.65
=3.65×(88+11+1)
=3.65×100
=365;
(4)49.5×0.2-2.07÷23
=9.9-0.09
=9.81;
(5)(1-0.2)÷(1-0.84)
=0.8÷0.16
=5;
(6)6.4÷0.8-1.5×4
=8-6
=2;
(7)2.6×1.9÷2.6×1.9
=(2.6÷2.6)×(1.9×1.9)
=1×3.61
=3.61;
(8)16.75-(9.1-1.92)+1.62
=16.75-7.18+1.62
=9.57+1.62
=11.19.
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第1个回答 2015-10-06
脱式计算
解:
(1)4.2×7.8+2.2×4.2
=4.2×(7.8+2.2)
=4.2×10
=42
(2)9.5×101
=9.5×(100+1)
=9.5×100+9.5×1
=950+9.5
=959.5
(3)3.65×88+3.65×11+3.65
=3.65×(88+11+1)
=3.65×100
=365
(4)49.5×0.2-2.07÷23
=9.9-0.09
=9.81
(5)(1-0.2)÷(1-0.84)
=0.8÷0.16
=5
(6)6.4÷0.8-1.5×4
=8-6
=2
(7)2.6×1.9÷2.6×1.9
=(2.6÷2.6)×(1.9×1.9)
=1×3.61
=3.61
(8)16.75-(9.1-1.92)+1.62
=16.75-7.18+1.62
=9.57+1.62
=11.19
解:
(1)4.2×7.8+2.2×4.2
=4.2×(7.8+2.2)
=4.2×10
=42
(2)9.5×101
=9.5×(100+1)
=9.5×100+9.5×1
=950+9.5
=959.5
(3)3.65×88+3.65×11+3.65
=3.65×(88+11+1)
=3.65×100
=365
(4)49.5×0.2-2.07÷23
=9.9-0.09
=9.81
(5)(1-0.2)÷(1-0.84)
=0.8÷0.16
=5
(6)6.4÷0.8-1.5×4
=8-6
=2
(7)2.6×1.9÷2.6×1.9
=(2.6÷2.6)×(1.9×1.9)
=1×3.61
=3.61
(8)16.75-(9.1-1.92)+1.62
=16.75-7.18+1.62
=9.57+1.62
=11.19